Identical balls are dropped from the same initial height and bounce back to half the initial height. In Case 1 the ball bounces off a cement floor and in case 2 the ball bounces off a piece of stretchy rubber. 1) In which case is the average force acting on the ball during the collision the biggest?

Question

Physics

Gunnar Hobbs

5 November, 05:57

Identical balls are dropped from the same initial height and bounce back to half the initial height. In Case 1 the ball bounces off a cement floor and in case 2 the ball bounces off a piece of stretchy rubber. 1) In which case is the average force acting on the ball during the collision the biggest?

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Answers (1)

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Lana Lyons · Answer 1

Case 1

Explanation:

Given : Identical balls are dropped from the same initial height and bounce back to half the initial height

In case 1 where the the ball bounces off a cement floor, because in this case the time of contact will be less (as compared with time of contact with the stretchy rubber) And hence, a greater force will be felt by the ball (actually impulse will be more).

impulse I = ΔF/Δt

ΔF = change in force and Δt = change in time