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In an elastic collision of two billiard ...

In an elastic collision of two billiard balls, which of the following quantities remain conserved during the short time of collision of the balls (i.e., when they are in contact).
(a) Kinetic energy . (b) Total linear momentum ?
Give reason for your answer in each case.

Text Solution

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Total linear momentum of the system of two balls is always conserved. While balls are in contact. There may be deformaiton which means eleastic PE which came from part of KE Therefore, KE may not be conserved.
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Anwer 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)? Is the total linear momentum conserved during the short time of an elastic collision of two balls? c) What are the answers to a) and b) for an inelastic collision? d) If the potenital energy of two billiard balls depends only on the separation distance between their centers, is the collision elastic or inelastic? (note we are talking here of potential energy corresponding to the force during collision, not gravitational potential energy).

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During elastic collision of two balls, is kinetic energy conserved during the short interval of contact of balls ?

Assertion: Collisionn between two billiard's ball are inelastic Reason: Momentum remains conserve during the collision.