what is 1. work 2. positive work 3.negative work 4. zero work 5. energy 6. kinetic energy 7.work energy theorem 8.conservative & non-conservative forces 9. power 10. potential energy 11. gravitational potential energy 12.potential energy of a spring 13. principal of conservation of mechanical energy 14.elastic & inelastic collisions 15. elastic dimensional elastic collision 16. one dimensional inelastic collision 17. two dimensional elastic collision 18.two dimensional elastic collision.

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Answer carefully, with reasons:

(a) In an elastic collision of two billiard balls, is the total kinetic energy conserved during the short time of collision of the balls (i.e. when they are in contact)?

(b) Is the total linear momentum conserved during the short time of an elastic collision of two balls?

(d) If the potential energy of two billiard balls depends only on the separation distance between their centres, is the collision elastic or inelastic? (Note, we are talking here of potential energy corresponding to the force during collision, not gravitational potential energy).

Answer carefully, with reasons :

(a) In an elastic collision of two billiard balls, is the total kinetic energy conserved during the short time of collision of the balls (i.e. when they are in contact) ?

(b) Is the total linear momentum conserved during the short time of an elastic collision of two balls ?

Q. In elastic collision,

A

is conserved while in inelastic collision

B

is conserved.
I.Momentum
II.Kinetic Energy
III.Potential Energy

Q. Assertion :Linear momentum is conserved in both, elastic and inelastic collisions. Reason: Total energy is conserved in all such collisions.

Q. Assertion :In elastic collision, kinetic energy is conserved. Reason: Energy is always conserved.

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