A girl wearing roller skates is standing in front of a wall. Assume that the whe

Question

A girl wearing roller skates is standing in front of a wall. Assume that the wheels on the skates are good enough that friction is negligible between the skates and the ground. The girl pushes off the wall and begins traveling away from the wall. Call the initial time when the girl was standing at rest in front of the wall with her hand touching the wall. The final time is when the girl has traveled 1.7 m away from the wall and is moving at a constant speed of 0.54 m/s. For the following situations, is the energy constant or not?

System: wall

System: girl+wall

System: girl

A girl is jumping on a trampoline. After coming off of the trampoline, she is in the air for 1.1 seconds. Call the initial time when the trampoline is at its lowest point with the girl still on the trampoline. The final time is 0.8 seconds after the girl comes off the trampoline. For the following situations, is the energy constant or not?

System: girl + trampoline + Earth

System: trampoline

System: girl

System: girl + trampoline

System: girl + Earth

Explanation / Answer

System: wall ; energy is not constant

System: girl+wall : energy iis constant

System: girl : energy is not constant

B)

System: girl + trampoline + Earth : constant

System: trampoline : not constant

System: girl : not constant

System: girl + trampoline : constant

System: girl + Earth : not constant

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