3) A bullet impacts a wooden block. In Case A the bullet is metallic and penetra

Question

3) A bullet impacts a wooden block. In Case A the bullet is metallic and penetrates the block. In Case B the bullet is made of rubber and bounces off the block. The block is the same in both cases and so is the speed of the bullets. a) Will the speed of the wooden block after the collision be (i) greater in Case A, (ii) greater in case B, or (iii) the same in both Cases? Explain your reasoning. b) In Case B, will the speed of the bullet after the collision be (i) greater than, (ii) less than, or (iii) the same as the speed of the bullet just before the collision? Explain your reasoning.

Explanation / Answer

a) so this is a conservation of momentum problem

in case B, the momentum of the block will be higher since bullet goes the other way

i.e. in A: p bullet = pblock + publlet final

in B p bullet = pblock - pbullet final

so pblock = pubullet + pbullet final

so ii)

b) since it gives energy to the block, its energy will be less

so speed will be less
so ii)

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