Consider again the situation described in the last question, in which a sponge m
ID: 3308393 • Letter: C
Question
Consider again the situation described in the last question, in which a sponge mounted on a low-friction cart collides with a rubber band. For the period between when the "sponge cart" first makes contact with the rubber band and when the sponge cart comes to a full stop, which one of the energy diagrams below best describes the interaction between the sponge cart and the rubber band? Contact push/pull Interaction Contact push/pull Interaction Sponge cart EnereyRbponge cart EnergxyRobnd Rubber band Rubber band Sponge cart Energy Decrease in KE ecrease A IncreaseDecrease in KE & EPE Increase in EPE in EPE Contact push/pull Interaction Contact push/pull Interaction | Sponge cart eyponge car EnergyRe Rubber Sponge cart Energy Rubber band band s C IncreaseDecrae DInepse Decrease in KE increase in EPE in EPE & KE in EPE in KEExplanation / Answer
1.
The sponge cart is transferring energy to the rubber band
The sponge cart will slow down after impact, so its KE will decrease. Also the sponge cart will compress, which will increase the EPE. Both stretching and compression will increase the EPE.
EPE of rubber band will will increase due ot stretching. Its KE is unchanged since it is held at rest.
So the correct answer is option C.
2.
The stretched elastic stings of the tennis racket is powering the tennis ball. In the case of racket, the stretched strings becomes un stretched. So the EPE decreases. Since the racket is held fixed, its KE remains unchanged. After the impact, the deformed tennis ball regains its shape, so the EPE decreases and after the impact the KE increases. So the correct answer is option C.