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Ix physics full notes chapter 2
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Ix physics full notes chapter 2

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  • 1. Force and Laws of MotionKey Learning:1. Force is a push or pull acting upon an object.2. Balanced forces: The resultant of all the forces acting ona body is zero.3. Unbalanced forces: The resultant of all the forces actingon a body is not zero.4. Newton’s first law of motion states that A body at rest willremain at rest and a body in motion will remain in uniformmotion unless acted upon by an unbalanced force.5. The property by the virtue of which an object tends toremain in the state of rest or of uniform motion unless actedupon by some force is called inertia.6. The mass of a body is a measure of inertia.7. The momentum of an object is the product of its massand velocity and has the same direction as that of thevelocity. Its SI unit is kg m s-¹.8. Newton’s second law of motion states that the rate ofchange of momentum of a body is directly proportional tothe force and takes place in the same direction as the force.9. Force is also defined as the product of mass andacceleration.10. The SI unit of force is kg m s-². This is also known asnewton and represented by the symbol N. A force of onenewton produced an acceleration of 1 m s-² on an object ofmass 1 kg.For More School Notes & Projects Visit www.toppersarena.com
  • 2. 11. Force of friction always opposes motion of objects.12. Two forces resulting from the interaction between twoobjects are calledaction and reaction forces respectively.13. Action and reaction forces act on two different bodiesbut they are equal n magnitude.14. Newton’s third law: For every action there is an equaland opposite reaction; but action and reaction acts ondifferent bodies.15. Law of conservation of momentum: The sum ofmomenta of the two objects before collision is equal to thesum of momenta after the collision provided there is noexternal unbalanced force acting on them.16. The velocity with which gun moves in the backwarddirection is known as the recoil velocity.Top Formulae:For More School Notes & Projects Visit www.toppersarena.com