{"id":9637,"date":"2018-02-13T12:02:32","date_gmt":"2018-02-13T06:32:32","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=9637"},"modified":"2018-03-19T11:42:56","modified_gmt":"2018-03-19T06:12:56","slug":"work-energy-class-9-notes-science","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/work-energy-class-9-notes-science\/","title":{"rendered":"Work and Energy class 9 Notes Science"},"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' ><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/work-energy-class-9-notes-science\/#CBSE_Guide_Work_and_Energy_class_9_Notes\" >CBSE Guide Work and Energy class 9 Notes<\/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\/work-energy-class-9-notes-science\/#9_Science_notes_Chapter_11_Work_and_Energy\" >9 Science notes Chapter 11 Work and Energy<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/work-energy-class-9-notes-science\/#Download_Revision_Notes_as_PDF\" >Download Revision Notes as PDF<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/work-energy-class-9-notes-science\/#Work_and_Energy_class_9_Notes\" >Work and Energy class 9 Notes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/work-energy-class-9-notes-science\/#CBSE_Class-9_Revision_Notes_and_Key_Points\" >CBSE Class-9 Revision Notes and Key Points<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>CBSE class 9 Science Chapter 11 Work and Energy notes in PDF are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Work and Energy class 9 Notes latest chapter wise notes for quick preparation of CBSE exams and school based annual examinations. Class 9 Science notes on Chapter 11 Work and Energy are also available for download in CBSE Guide website.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Guide_Work_and_Energy_class_9_Notes\"><\/span>CBSE Guide Work and Energy class 9 Notes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>CBSE guide notes are the comprehensive notes which covers the latest syllabus of CBSE and NCERT. It includes all the topics given in NCERT class 9 Science text book. Users can download CBSE guide quick revision notes from myCBSEguide mobile app and my CBSE guide website.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"9_Science_notes_Chapter_11_Work_and_Energy\"><\/span>9 Science notes Chapter 11 Work and Energy<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Download CBSE class 9th revision notes for Chapter 11 Work and Energy in PDF format for free. Download revision notes for Work and Energy class 9 Notes and score high in exams. These are the Work and Energy class 9 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the best tips recommended by teachers during exam days.<\/p>\n<h1 style=\"text-align: center\"><span class=\"ez-toc-section\" id=\"Download_Revision_Notes_as_PDF\"><\/span><strong><a href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-09-science\/1218\/cbse-revision-notes\/7\/\">Download Revision Notes as PDF<\/a><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p style=\"text-align: center\"><strong>CBSE Class 9 Science<br \/>\nRevision Notes<br \/>\nCHAPTER \u2013\u00a011<br \/>\nWork &amp; Energy<\/strong><\/p>\n<p>1. Work Done By A Constant Force<\/p>\n<ul>\n<li>Work is a scalar quantity equal to the product of the displacement x and the component of the force Fx in the direction of the displacement..<\/li>\n<li>Work is defined as a force acting upon an object to cause a displacement<\/li>\n<li>Mathematically, work can be expressed by the following equation.<br \/>\n<span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{\\text{W}} \\bullet {\\text{F x d cos q }}\\left( {{\\text{ cos }}{0^0} \\bullet {\\text{1}}} \\right)\" \/><\/span><\/span><\/li>\n<li>where F &#8211; force, d &#8211; displacement, and the angle (theta) is defined as the angle between the force and the displacement vector<\/li>\n<li>Three things are necessary for the performance of work:<\/li>\n<li>There must be an applied force F.<\/li>\n<li>There must be a displacement x.<\/li>\n<li>The force must have a component along the displacement<\/li>\n<\/ul>\n<p><strong>Negative Work<\/strong><br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch11_02.jpg\" \/><br \/>\nThe friction force f opposes the displacement<\/p>\n<p><strong>Positive Work<\/strong><br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch11_03.jpg\" \/><br \/>\n<strong>Force F contributes to displacement x.<\/strong><\/p>\n<p><strong>2. Energy And Its Forms <\/strong><\/p>\n<p>The metric system unit of energy is the joule (J), after James Joule.<\/p>\n<p>\u2022 Mechanical energy is the energy which is possessed by an object due to its motion or its stored energy of position<\/p>\n<p><strong>Forms of Energy <\/strong><\/p>\n<p><strong>\u2022 Kinetic energy<\/strong> : is the energy of motion<\/p>\n<p>Energy which a body possesses because of its motion, which occurs anywhere from an atomic level to that of a whole organism<br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch11_05.jpg\" \/><br \/>\nExamples of Kinetic Energy: This is not an all-inclusive list.<\/p>\n<ul>\n<li>Electrical \u2013 The movement of atoms<\/li>\n<li>Electromagnetic or Radiant \u2013 The movement of waves<\/li>\n<li>Thermal or Heat \u2013 The movement of molecules<\/li>\n<li>Motion \u2013 The movement of objects<\/li>\n<li>Sound \u2013 The movement through waves<\/li>\n<\/ul>\n<p>Engineers generally refer to thermal\/heat energy as \u201cinternal energy\u201d and use \u201ckinetic energy\u201d strictly in reference to motion. Potential Energy (Stored energy or gravitational energy)<\/p>\n<ul>\n<li>The capacity to do work by virtue of position or configuration<\/li>\n<\/ul>\n<ul>\n<li>an object can store energy as the result of its position or elastic source<\/li>\n<li>Potential Energy is maximum at the maximum HEIGHT<\/li>\n<\/ul>\n<p>Energy transformation involves the conversion of one form of energy into another form. Examples of energy transformation include:<\/p>\n<p>\u2022 Chemical \u2013 Food is consumed and converted into motion for playing sports or taking a test.<\/p>\n<p>\u2022 Radiant \u2013 Sunlight is consumed by plants and converted into energy for growth.<\/p>\n<p>\u2022 Electrical \u2013 Energy transferred to an oven is converted to thermal energy for heating our food.<\/p>\n<p>Now you know the basic forms of energy. The next question is \u201cWhat are the energy sources?\u201d<\/p>\n<p>There are renewable and nonrenewable sources of energy. A renewable energy source is a form of energy that is constantly and rapidly replenished by natural processes.<\/p>\n<p>Examples of <strong>renewable energy sources<\/strong> include:<\/p>\n<p>\u2022 Biomass \u2013 The use of a living or once living organism as fuel<\/p>\n<p>\u2022 Hydropower \u2013 The energy produced from the movement of water<\/p>\n<p>\u2022 Geothermal \u2013 The use of heat from within the Earth or from the atmosphere near oceans to warm houses or other buildings<\/p>\n<p>\u2022 Wind \u2013 The use of wind to generate electricity<\/p>\n<p>Solar \u2013 The use of the sun as a source of heat; for instance, to heat a room within a house, etc.<\/p>\n<p><strong>Energy Conversion<\/strong><\/p>\n<p>Fossil fuels Chemical \u2192 Heat \u2192 Mechanical \u2192 Electrical<\/p>\n<p>Solar cells Sunlight \u2192 Electrical<\/p>\n<p>Wind turbines Kinetic \u2192 Mechanical \u2192 Electrical<\/p>\n<p>Hydroelectric Gravitational potential \u2192 Mechanical \u2192 Electrical<\/p>\n<p>Nuclear Nuclear \u2192 Heat \u2192 Mechanical \u2192 Electrical<br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch11_07.png\" \/><\/p>\n<p><strong>3. Potential energy of an object at a height <\/strong><\/p>\n<p>An object increases its energy when raised through a height.<\/p>\n<p>The potential energy of an object at a height depends on the ground level or the zero level<\/p>\n<p><strong>4. Law Of Conservation Of Energy <\/strong><\/p>\n<p>The principle of Conservation of Mechanical Energy<\/p>\n<p>The total mechanical energy <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\left( {{\\text{E = KE}} + {\\text{PE}}} \\right)\" \/><\/span><\/span>\u00a0of an object remains constant as the object moves, provided that the net work done by external non-conservative forces is zero, <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{{\\text{W}}_{nc}} = 0{\\text{J}}\" \/><\/span><\/span><\/p>\n<p>Total mechanical energy: the sum of kinetic energy and gravitational potential energy<\/p>\n<p>E=KE+PE<\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{W_{nc}} = (K{E_f} - K{E_0}) + (P{E_f} - P{E_0})\" \/><\/span><\/span><\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{W_{nc}} = (K{E_f} + P{E_f}) - (K{E_0} + P{E_0})\" \/><\/span><\/span><\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{W_{nc}} = {E_f} - {E_0}\" \/><\/span><\/span><\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{E_f} = - K{E_f} + P{E_f}\" \/><\/span><\/span><\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?E = K{E_0} + P{E_0}\" \/><\/span><\/span><\/p>\n<p>5. <strong>Rate of Doing Work &amp; Commercial Unit Of Energy POWER<\/strong><\/p>\n<p>Rate at which work is performed or energy is expended <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?P = \\frac{W}{t}\" \/><\/span><\/span><\/p>\n<p>Watt is the base unit of Power .One watt is equal to 1 joule of work per second<\/p>\n<p><strong>Types of Power <\/strong><\/p>\n<ul>\n<li>Electrical Power<\/li>\n<\/ul>\n<p>Uses electrical energy to do work<\/p>\n<ul>\n<li>Mechanical Power<\/li>\n<\/ul>\n<p>Uses mechanical energy to do work (linear, rotary)<\/p>\n<ul>\n<li>Fluid Power<\/li>\n<\/ul>\n<p>Uses energy transferred by liquids (hydraulic) and gases (pneumatic)<\/p>\n<p>\u2022 Power is the rate that we use energy.<\/p>\n<p>\u2022 Power = Work or Energy \/ Time<\/p>\n<p>\u2022 <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{\\text{P }} = {\\text{ W}}\/{\\text{t }} = {\\text{ F }} \\times {\\text{ d}}\/{\\text{t }} = {\\text{ F v}}\" \/><\/span><\/span><\/p>\n<p>\u2022 The unit joule is too small .The bigger unit of energy called kilowatt hour (kW h)<\/p>\n<p>1 kW h is the energy used in one hour<\/p>\n<p>at the rate of <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{\\text{1}}000{\\text{ J s}}--{\\text{1 }}\\left( {{\\text{or 1 kW}}} \\right).\" \/><\/span><\/span><\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{\\text{1 kW h }} = {\\text{ 1 kW }}*{\\text{1 h}}\" \/><\/span><\/span><\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\begin{gathered} = {\\text{ }}1000{\\text{ }}W*3600{\\text{ }}s \\\\ = {\\text{ }}3600000{\\text{ }}J \\\\ 1{\\text{ }}kW{\\text{ }}h{\\text{ }} = {\\text{ }}3.6{\\text{ }}x{\\text{ }}{10^6}J. \\\\\\end{gathered}\" \/><\/span><\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Work_and_Energy_class_9_Notes\"><\/span>Work and Energy class 9 Notes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>CBSE Revision notes (PDF Download) Free<\/li>\n<li>CBSE Revision notes for Class 9 Science PDF<\/li>\n<li>CBSE Revision notes Class 9 Science \u2013 CBSE<\/li>\n<li>CBSE Revisions notes and Key Points Class 9 Science<\/li>\n<li>Summary of the NCERT books all chapters in Science class 9<\/li>\n<li>Short notes for CBSE class 9th Science<\/li>\n<li>Key notes and chapter summary of Science class 9<\/li>\n<li>Quick revision notes for CBSE exams<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Class-9_Revision_Notes_and_Key_Points\"><\/span><strong>CBSE Class-9 Revision Notes and Key Points<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Work and Energy class 9 Notes. CBSE quick revision note for Class-9 Science, Chemistry, Maths, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days.<\/p>\n<ul>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-09-mathematics\/1234\/cbse-revision-notes\/7\/\">Revision Notes for class-09 Mathematics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-09-science\/1218\/cbse-revision-notes\/7\/\">Revision Notes for class-09 Science<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-09-social-science\/1895\/cbse-revision-notes\/7\/\">Revision Notes for class-09 Social Science<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-09-english-communicative\/1900\/cbse-revision-notes\/7\/\">Revision Notes for class-09 English Communicative<\/a><\/li>\n<\/ul>\n<p>To download Work and Energy class 9 Notes, sample paper for class 9 Mathematics, Social Science, Science, English Communicative; 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<ul>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/matter-surrounding-class-9-notes-science\/\">Matter in Our Surrounding class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/matter-around-us-pure-class-9-notes-science\/\">Is Matter around Us Pure class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/atoms-molecules-class-9-notes-science\/\">Atoms and Molecules class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/structure-atoms-class-9-notes-science\/\">Structure of the Atoms class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/fundamental-unit-life-class-9-notes-science\/\">The Fundamental Unit of Life class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/tissues-class-9-notes-science\/\">Tissues class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/diversity-living-organisms-class-9-notes-science\/\">Diversity in Living Organisms class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/motion-class-9-notes-science\/\">Motion class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/forces-laws-motion-class-9-notes-science\/\">Forces and Laws of Motion class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/gravitation-class-9-notes-science\/\">Gravitation class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/work-energy-class-9-notes-science\/\">Work and Energy class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/sound-class-9-notes-science\/\">Sound class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/fall-ill-class-9-notes-science\/\">Why Do We Fall ill class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/natural-resources-class-9-notes-science\/\">Natural Resources class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/improvement-food-resources-class-9-notes-science\/\">Improvement in Food Resources class 9 Notes Science<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>CBSE class 9 Science Chapter 11 Work and Energy notes in PDF are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Work and Energy class 9 Notes latest chapter wise notes for quick preparation of CBSE exams and school based annual examinations. Class 9 Science notes on &#8230; <a title=\"Work and Energy class 9 Notes Science\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/work-energy-class-9-notes-science\/\" aria-label=\"More on Work and Energy class 9 Notes Science\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":9574,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45,456],"tags":[457,150,426,240,673],"class_list":["post-9637","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cbse-class-09","category-revision-notes","tag-cbse-notes","tag-cbse-notes-and-key-points","tag-quick-revision","tag-quick-revision-notes","tag-work-and-energy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Work and Energy class 9 Notes Science | myCBSEguide<\/title>\n<meta name=\"description\" content=\"Work and Energy class 9 Notes Social Science chapter 11 in PDF format for free download. 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