{"id":4145,"date":"2016-05-06T11:49:00","date_gmt":"2016-05-06T11:49:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-work-and-energy-part-2\/"},"modified":"2018-06-07T18:25:24","modified_gmt":"2018-06-07T12:55:24","slug":"ncert-solutions-for-class-9-science-work-and-energy-part-2","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/","title":{"rendered":"NCERT Solutions for Class 9 Science Work and Energy part 2"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#NCERT_Class_9_Science_Chapter_wise_Solutions\" >NCERT Class 9 Science Chapter wise Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#NCERT_Solutions_for_Class_9_Science_Work_and_Energy_part_2\" >NCERT Solutions for Class 9 Science Work and Energy part 2<\/a><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#1_Look_at_the_activities_listed_below_Reason_out_whether_or_not_work_is_done_in_the_light_of_your_understanding_of_the_term_%E2%80%98work\" >1. Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term \u2018work\u2019.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#2_An_object_thrown_at_a_certain_angle_to_the_ground_moves_in_a_curved_path_and_falls_back_to_the_ground_The_initial_and_the_final_points_of_the_path_of_the_object_lie_on_the_same_horizontal_line_What_is_the_work_done_by_the_force_of_gravity_on_the_object\" >2. An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#3_A_battery_lights_a_bulb_Describe_the_energy_changes_involved_in_the_process\" >3. A battery lights a bulb. Describe the energy changes involved in the process.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#4_Certain_force_acting_on_a_20_kg_mass_changes_its_velocity_from_y_to_Calculate_the_work_done_by_the_force\" >4. Certain force acting on a 20 kg mass changes its velocity from y to. Calculate the work done by the force.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#5_A_mass_of_10_kg_is_at_a_point_A_on_a_table_It_is_moved_to_a_point_B_If_the_line_joining_A_and_B_is_horizontal_what_is_the_work_done_on_the_object_by_the_gravitational_force_Explain_your_answer\" >5. A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#6_The_potential_energy_of_a_freely_falling_object_decreases_progressively_Does_this_violate_the_law_of_conservation_of_energy_Why\" >6. The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#7_What_are_the_various_energy_transformations_that_occur_when_you_are_riding_a_bicycle\" >7. What are the various energy transformations that occur when you are riding a bicycle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#8_Does_the_transfer_of_energy_take_place_when_you_push_a_huge_rock_with_all_you_might_and_fail_to_move_it_Where_is_the_energy_you_spend_going\" >8. Does the transfer of energy take place when you push a huge rock with all you might and fail to move it? Where is the energy you spend going?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#9_A_certain_household_has_consumed_250_units_of_energy_during_a_month_How_much_energy_is_this_in_joules\" >9. A certain household has consumed 250 units of energy during a month. How much energy is this in joules?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#10_An_object_of_mass_40_kg_is_raised_to_a_height_of_5_m_above_the_ground_What_is_its_potential_energy_If_the_object_is_allowed_to_fall_find_its_kinetic_energy_when_it_is_half_way_down\" >10. An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#11_What_is_the_work_done_by_the_force_of_gravity_on_a_satellite_moving_round_the_earth_Justify_your_answer\" >11. What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#12_Can_there_be_displacement_of_an_object_in_the_absence_of_any_force_acting_on_it_Think_Discuss_this_question_with_your_friends_and_teacher\" >12. Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#13_A_person_holds_a_bundle_of_hay_over_his_head_for_30_minutes_and_gets_tired_Has_he_done_some_work_or_not_Justify_your_answer\" >13. A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#14_An_electric_heater_is_rated_1500_W_How_much_energy_does_it_use_in_10_hours\" >14. An electric heater is rated 1500 W. How much energy does it use in 10 hours?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#15_Illustrate_the_law_of_conservation_of_energy_by_discussing_the_energy_changes_which_occur_when_we_draw_a_pendulum_bob_to_one_side_and_allow_it_to_oscillate_Why_does_the_bob_eventually_come_to_rest_What_happens_to_its_energy_eventually_Is_it_a_violation_of_the_law_of_conservation_of_energy\" >15. Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#16_An_object_of_mass_m_is_moving_with_a_constant_velocity_v_How_much_work_should_be_done_on_the_object_in_order_to_bring_the_object_to_rest\" >16. An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#17_Calculate_the_work_required_to_be_done_to_stop_a_car_of_1500_kg_moving_at_a_velocity_of_60_kmh\" >17. Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km\/h?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#18_In_each_of_the_following_a_force_F_is_acting_on_an_object_of_mass_m_The_direction_of_displacement_is_from_west_to_east_shown_by_the_longer_arrow_Observe_the_diagrams_carefully_and_state_whether_the_work_done_by_the_force_is_negative_positive_or_zero\" >18. In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#19_Soni_says_that_the_acceleration_in_an_object_could_be_zero_even_when_several_forces_are_acting_on_it_Do_you_agree_with_her_Why\" >19. Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#20_Find_the_energy_in_kW_h_consumed_in_10_hours_by_four_devices_of_power_500_W_each\" >20. Find the energy in kW h consumed in 10 hours by four devices of power 500 W each.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#21_A_freely_falling_object_eventually_stops_on_reaching_the_ground_What_happens_to_its_kinetic_energy\" >21. A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#NCERT_Solutions_for_Class_9_Science\" >NCERT Solutions for Class 9 Science<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/#CBSE_app_for_Class_9\" >CBSE app for Class 9<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions for Class 9 Science Work and Energy part 2 Class 9 Science book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 9 Science chapter wise NCERT solution for Science Book for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>NCERT solutions for Science\u00a0 Work and Energy <a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-09-science\/1218\/ncert-solutions\/5\/\">Download as PDF<\/a><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/09_Science_Book.jpg\" alt=\"NCERT Solutions for Class 9 Science Work and Energy part 2\" width=\"197\" height=\"265\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_9_Science_Chapter_wise_Solutions\"><\/span><span class=\"underline-text\">NCERT Class 9 Science Chapter wise Solutions<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>01 \u2013 \u00a0Matter in Our Surroundings<\/li>\n<li>02 \u2013 Is Matter Around us Pure<\/li>\n<li>03 \u2013 Atoms and Molecules<\/li>\n<li>04 \u2013 Structure of the Atom<\/li>\n<li>05 \u2013 The Fundamental Unit of Life<\/li>\n<li>06 \u2013 Tissues<\/li>\n<li>07 \u2013 Diversity in Living Organisms<\/li>\n<li>08 \u2013 Motion<\/li>\n<li>09 \u2013 Force and Laws of Motion<\/li>\n<li>10 \u2013 Gravitation<\/li>\n<li>11 \u2013 Word and Energy<\/li>\n<li>12 \u2013 Sound<\/li>\n<li>13 \u2013 Why Do We Fall Ill<\/li>\n<li>14 \u2013 Natural Resources<\/li>\n<li>15 \u2013 Improvement in Food Resources<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_9_Science_Work_and_Energy_part_2\"><\/span>NCERT Solutions for Class 9 Science Work and Energy part 2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_Look_at_the_activities_listed_below_Reason_out_whether_or_not_work_is_done_in_the_light_of_your_understanding_of_the_term_%E2%80%98work\"><\/span><strong>1. Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term \u2018work\u2019.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>\u2022 Suma is swimming in a pond.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>\u2022 A donkey is carrying a load on its back.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>\u2022 A wind-mill is lifting water from a well.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>\u2022 A green plant is carrying out photosynthesis.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>\u2022 An engine is pulling a train.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>\u2022 Food grains are getting dried in the sun.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>\u2022 A sailboat is moving due to wind energy.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Work will be done if a force acts on an object and displacement occurs in the direction of force. According to this explanation work is done in following activities:<\/p>\n<p style=\"text-align: justify;\">\u2022 Suma is swimming in a pond.<\/p>\n<p style=\"text-align: justify;\">\u2022 A donkey is carrying a load on its back.<\/p>\n<p style=\"text-align: justify;\">\u2022 A wind-mill is lifting water from a well.<\/p>\n<p style=\"text-align: justify;\">\u2022 An engine is pulling a train.<\/p>\n<p style=\"text-align: justify;\">\u2022 A sailboat is moving due to wind energy.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Work and Energy part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"2_An_object_thrown_at_a_certain_angle_to_the_ground_moves_in_a_curved_path_and_falls_back_to_the_ground_The_initial_and_the_final_points_of_the_path_of_the_object_lie_on_the_same_horizontal_line_What_is_the_work_done_by_the_force_of_gravity_on_the_object\"><\/span><strong>2. An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>For calculating work done there must be displacement but since in this example vertical displacement is zero (as initial and final points lie on the same horizontal line) so the work done by force of gravity is zero.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"3_A_battery_lights_a_bulb_Describe_the_energy_changes_involved_in_the_process\"><\/span><strong>3. A battery lights a bulb. Describe the energy changes involved in the process.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Chemical energy of battery is changed into heat energy and light energy.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Work and Energy part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"4_Certain_force_acting_on_a_20_kg_mass_changes_its_velocity_from_y_to_Calculate_the_work_done_by_the_force\"><\/span><strong>4. Certain force acting on a 20 kg mass changes its velocity from y<img decoding=\"async\" style=\"height: 22px; width: 51px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image013.png\" \/> to<img decoding=\"async\" style=\"height: 22px; width: 52px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image014.png\" \/>. Calculate the work done by the force.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Work done by the force = change in kinetic energy<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 42px; width: 116px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image015.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 42px; width: 127px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image016.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 26px; width: 152px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image017.png\" \/>= 210 J<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"5_A_mass_of_10_kg_is_at_a_point_A_on_a_table_It_is_moved_to_a_point_B_If_the_line_joining_A_and_B_is_horizontal_what_is_the_work_done_on_the_object_by_the_gravitational_force_Explain_your_answer\"><\/span><strong>5. A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Since work done on the object by gravitational force depends upon change in the vertical height of the object. Vertical height of the object is not changing as the joining A and B is horizontal at the same height hence the work done is zero.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Work and Energy part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"6_The_potential_energy_of_a_freely_falling_object_decreases_progressively_Does_this_violate_the_law_of_conservation_of_energy_Why\"><\/span><strong>6. The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>It doesn\u2019t violate the law of conservation of energy because the potential energy of a freely falling object decreases progressively since it keeps changing into kinetic energy of the free falling object therefore the total energy to the object remains conserved.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"7_What_are_the_various_energy_transformations_that_occur_when_you_are_riding_a_bicycle\"><\/span><strong>7. What are the various energy transformations that occur when you are riding a bicycle?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>It is the transformation of our muscular energy into mechanical energy to ride the bicycle.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"8_Does_the_transfer_of_energy_take_place_when_you_push_a_huge_rock_with_all_you_might_and_fail_to_move_it_Where_is_the_energy_you_spend_going\"><\/span><strong>8. Does the transfer of energy take place when you push a huge rock with all you might and fail to move it? Where is the energy you spend going?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>While we push a huge rock with all our might(power) but fail to move it no energy transfer occurs as cellular energy simply wastes out in muscle contraction and relaxation even heat generation(sweating).<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"9_A_certain_household_has_consumed_250_units_of_energy_during_a_month_How_much_energy_is_this_in_joules\"><\/span><strong>9. A certain household has consumed 250 units of energy during a month. How much energy is this in joules?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Energy consumed by a certain household = 250 kWh<\/p>\n<p style=\"text-align: justify;\">since 1 kWh <img decoding=\"async\" style=\"height: 22px; width: 85px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image018.png\" \/><\/p>\n<p style=\"text-align: justify;\">therefore 250 kWh<img decoding=\"async\" style=\"height: 22px; width: 110px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image019.png\" \/><img decoding=\"async\" style=\"height: 22px; width: 74px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image020.png\" \/><\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Work and Energy part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"10_An_object_of_mass_40_kg_is_raised_to_a_height_of_5_m_above_the_ground_What_is_its_potential_energy_If_the_object_is_allowed_to_fall_find_its_kinetic_energy_when_it_is_half_way_down\"><\/span><strong>10. An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Potential energy <img decoding=\"async\" style=\"height: 26px; width: 178px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image021.png\" \/>= 2000 J<\/p>\n<p style=\"text-align: justify;\">When the object is half way down the height of the object is = 2.5 m<\/p>\n<p style=\"text-align: justify;\">initial velocity (u) = 0 (thrown from ground\/rest)<\/p>\n<p style=\"text-align: justify;\">since <img decoding=\"async\" style=\"height: 24px; width: 100px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image022.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 19px; width: 107px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image023.png\" \/><\/p>\n<p style=\"text-align: justify;\">= 50<\/p>\n<p style=\"text-align: justify;\">Kinetic energy <img decoding=\"async\" style=\"height: 42px; width: 82px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image024.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 42px; width: 84px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image025.png\" \/>= 1000 J<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"11_What_is_the_work_done_by_the_force_of_gravity_on_a_satellite_moving_round_the_earth_Justify_your_answer\"><\/span><strong>11. What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>The satellite is moving on a round path, displacement in the object is perpendicular to the direction of force. <img decoding=\"async\" style=\"height: 19px; width: 48px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image026.png\" \/> <sup>0<\/sup>.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 19px; width: 110px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image027.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 22px; width: 110px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image028.png\" \/><\/p>\n<p style=\"text-align: justify;\"><sup> <img decoding=\"async\" style=\"height: 19px; width: 88px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image029.png\" \/><\/sup><\/p>\n<p style=\"text-align: justify;\">Therefore, work done is zero.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Work and Energy part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"12_Can_there_be_displacement_of_an_object_in_the_absence_of_any_force_acting_on_it_Think_Discuss_this_question_with_your_friends_and_teacher\"><\/span><strong>12. Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>No.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"13_A_person_holds_a_bundle_of_hay_over_his_head_for_30_minutes_and_gets_tired_Has_he_done_some_work_or_not_Justify_your_answer\"><\/span><strong>13. A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>When a person holds a bundle of hay over his head for 30 minutes and gets tired he applies force in upward direction and displacement of bundle of hay is in forward direction which is perpendicular to the direction of force applied therefore displacement is zero<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 19px; width: 115px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image030.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 22px; width: 110px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image028.png\" \/><\/p>\n<p style=\"text-align: justify;\"><sup> <img decoding=\"async\" style=\"height: 19px; width: 88px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image029.png\" \/><\/sup><\/p>\n<p style=\"text-align: justify;\">No work done.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Work and Energy part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"14_An_electric_heater_is_rated_1500_W_How_much_energy_does_it_use_in_10_hours\"><\/span><strong>14. An electric heater is rated 1500 W. How much energy does it use in 10 hours?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Electric heater\u2019s power (p) = 1500 W = 1.5 kW<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 22px; width: 163px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image031.png\" \/><img decoding=\"async\" style=\"height: 19px; width: 102px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image032.png\" \/>= 15 kWh<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"15_Illustrate_the_law_of_conservation_of_energy_by_discussing_the_energy_changes_which_occur_when_we_draw_a_pendulum_bob_to_one_side_and_allow_it_to_oscillate_Why_does_the_bob_eventually_come_to_rest_What_happens_to_its_energy_eventually_Is_it_a_violation_of_the_law_of_conservation_of_energy\"><\/span><strong>15. Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>The bob eventually comes to rest due to the frictional force offered by the air and the rigid support holding the thread.<\/p>\n<p style=\"text-align: justify;\">It is not a violation of the law of conservation of energy since mechanical energy can get converted into another form of energy which cannot be utilised for useful work. This loss of energy is called dissipation of energy.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Work and Energy part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"16_An_object_of_mass_m_is_moving_with_a_constant_velocity_v_How_much_work_should_be_done_on_the_object_in_order_to_bring_the_object_to_rest\"><\/span><strong>16. An object of mass, <em>m <\/em>is moving with a constant velocity, <em>v<\/em>. How much work should be done on the object in order to bring the object to rest?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>In order to bring the object to rest the work done must be equal to the kinetic energy of the moving object <img decoding=\"async\" style=\"height: 22px; width: 62px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image033.png\" \/><\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"17_Calculate_the_work_required_to_be_done_to_stop_a_car_of_1500_kg_moving_at_a_velocity_of_60_kmh\"><\/span><strong>17. Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km\/h?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Initial velocity of the car (u) = 60 km\/h <img decoding=\"async\" style=\"height: 26px; width: 149px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image034.png\" \/><img decoding=\"async\" style=\"height: 22px; width: 88px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image035.png\" \/><\/p>\n<p style=\"text-align: justify;\">Final velocity (v) = 0 (object has to be stopped)<\/p>\n<p style=\"text-align: justify;\">Initial kinetic energy <img decoding=\"async\" style=\"height: 42px; width: 87px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image036.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 42px; width: 133px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image037.png\" \/>= 208333.30 J<\/p>\n<p style=\"text-align: justify;\">Final kinetic energy <img decoding=\"async\" style=\"height: 42px; width: 91px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image038.png\" \/>= 0<\/p>\n<p style=\"text-align: justify;\">Therefore, work done = change in kinetic energy = 208333.30 \u2015 0 = 208333.30 J<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Work and Energy part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"18_In_each_of_the_following_a_force_F_is_acting_on_an_object_of_mass_m_The_direction_of_displacement_is_from_west_to_east_shown_by_the_longer_arrow_Observe_the_diagrams_carefully_and_state_whether_the_work_done_by_the_force_is_negative_positive_or_zero\"><\/span><strong>18. In each of the following a force, <em>F <\/em>is acting on an object of mass, <em>m<\/em>. The direction of displacement is from west to east shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong> <img decoding=\"async\" id=\"Picture 1\" style=\"height: 66px; width: 461px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image039.jpg\" alt=\"Chapter%2011_html_56647298.jpg\" \/><\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (i)<\/strong> Since in this diagram displacement is perpendicular to the direction of force, so work done is zero.<\/p>\n<p style=\"text-align: justify;\"><strong>(ii)<\/strong> Since in this diagram displacement is in the direction of force, so work done is positive.<\/p>\n<p style=\"text-align: justify;\"><strong>(iii)<\/strong> Since in this diagram displacement is in the opposite direction of the force applied hence work done is negative.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"19_Soni_says_that_the_acceleration_in_an_object_could_be_zero_even_when_several_forces_are_acting_on_it_Do_you_agree_with_her_Why\"><\/span><strong>19. Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Yes we agree with her statement. Because when many balanced forces act on the object its displacement becomes zero.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"20_Find_the_energy_in_kW_h_consumed_in_10_hours_by_four_devices_of_power_500_W_each\"><\/span><strong>20. Find the energy in kW h consumed in 10 hours by four devices of power 500 W each.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Since Energy = power x time<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 19px; width: 93px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch11\/image040.png\" \/>= 20000 Wh = 20 kWh<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Work and Energy part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"21_A_freely_falling_object_eventually_stops_on_reaching_the_ground_What_happens_to_its_kinetic_energy\"><\/span><strong>21. A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>A free falling object eventually stops on reaching the ground since on striking the ground its kinetic energy is transmitted to the ground.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_9_Science\"><\/span>NCERT Solutions for Class 9 Science<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 9 Science PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 9 Science includes text book solutions .NCERT Solutions for CBSE Class 9 Science have total 15 chapters. 9 Science NCERT Solutions in PDF for free Download on our website. Ncert Science class 9 solutions PDF and Science ncert class 9 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_app_for_Class_9\"><\/span>CBSE app for Class 9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To download\u00a0NCERT Solutions for class 9 Science, Computer Science, Home Science,Hindi ,English, Maths Social Science do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 9 Science Work and Energy part 2 Class 9 Science book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text &#8230; <a title=\"NCERT Solutions for Class 9 Science Work and Energy part 2\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-work-and-energy-part-2\/\" aria-label=\"More on NCERT Solutions for Class 9 Science Work and Energy part 2\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":-1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[281,1377],"tags":[283,1344,216,349],"class_list":["post-4145","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-science-cbse-class-09","tag-cbse-study-material","tag-class-9","tag-ncert-solutions","tag-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 9 Science Work and Energy part 2<\/title>\n<meta name=\"description\" content=\"NCERT Solutions for Class 9 Science Work and Energy part 2 in PDF format for free download. 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