Force and Pressure class 8 Notes Science

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Class 8 Science notes Chapter 11 Force and Pressure

Download CBSE class 8th revision notes for chapter 11 Force and Pressure in PDF format for free. Download revision notes for Force and Pressure class 8 Notes and score high in exams. These are the Force and Pressure class 8 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter 11 in minutes. Revision notes in exam days is one of the best tips recommended by teachers during exam days.

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CBSE Class 8 Revision Notes Science Force and Pressure class 8 Notes Science

• Force: A push or a pull, that changes or tends to change the state of rest or of uniform motion of an object or changes its direction or shape.
• A force arises due to the interaction between two objects.
• Force has magnitude as well as direction. The SI unit of force is Newton.
• A change in the speed of an object or the direction of its motion or both implies a change in its state of motion.
• Force acting on an object may cause a change in its state of motion or a change in its shape.
• A force can act on an object with or without being in contact with it. Types of Forces:
  Contact Forces: The forces act on a body when the source of force is in actual contact with the body. The point where the force is applied on an object is called the point of application of force (or point of contact).
• (i)  Muscular Force: The force exerted by the muscles of the body. We make use of muscular force of animals like bullocks, horses and camels to get our activities done.
• (ii)  Mechanical Force: The force produced by a machine.
• (iii)  Frictional Force: The force that opposes the motion of an object.Non-Contact Forces: Forces which do not involve physical contact between two bodies on which they act.
• (i)  Magnetic Force: A magnet exerts a non-contact force on objects made of iron, steel, cobalt or nickel.
  (ii)  Electrostatic Force: The force which results due to repulsion of similar charges or attraction of opposite charges.
  (iii)  Gravitational Forces: The force that exists between any two bodies by virtue of their mass.
• Pressure: Thrust acting per unit surface area is called pressure. Thrust is the force acting on an object perpendicular to its surface. In SI system, pressure is measured in newton per square meter which is equal to 1 pascal (Pa).
• Like solids, fluids (liquids and gases) also exert pressure. A solid exerts pressure only in the downward direction due its weight, whereas liquids and gases exert pressure in all directions. Hence liquids and gases exert pressure on the walls of their container.
• The thick blanket of air that covers the earth is termed atmosphere. The pressure exerted by the atmosphere is called atmospheric pressure. The tremendous atmospheric pressure surrounding us is not felt by us because the fluid pressure inside our bodies counter-balances the atmospheric pressure around us.

CBSE Class 8 Revision Notes and Key Points

Force and Pressure class 8 Notes Science. CBSE quick revision note for class-8 Science, Chemistry, Math’s, 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.

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