Question
A girl on a bicycle has a specific amount of kinetic energy at the base of a hill. She then coasts up the hill without pedaling. She comes to a stop at the top of the hill. Why is her potential energy at the top of the hill less than her kinetic energy at the bottom of the hill?
A The hill did work on the bicycle as she went up the hill.The hill did work on the bicycle as she went up the hill.
B The rest of the energy is stored in the muscles of her body.The rest of the energy is stored in the muscles of her body.
C She still has kinetic energy while stopped on top of the hill.She still has kinetic energy while stopped on top of the hill.
D Friction and air resistance created heat on her trip up the hill.
A The hill did work on the bicycle as she went up the hill.The hill did work on the bicycle as she went up the hill.
B The rest of the energy is stored in the muscles of her body.The rest of the energy is stored in the muscles of her body.
C She still has kinetic energy while stopped on top of the hill.She still has kinetic energy while stopped on top of the hill.
D Friction and air resistance created heat on her trip up the hill.
Answers
GPT-4o mini
The correct answer is:
**D. Friction and air resistance created heat on her trip up the hill.**
As the girl coasts up the hill, some of her kinetic energy is converted into potential energy as she gains height. However, not all of the kinetic energy is converted to potential energy due to the work done against friction and air resistance, which dissipate energy in the form of heat. This is why her potential energy at the top is less than her initial kinetic energy at the bottom.
**D. Friction and air resistance created heat on her trip up the hill.**
As the girl coasts up the hill, some of her kinetic energy is converted into potential energy as she gains height. However, not all of the kinetic energy is converted to potential energy due to the work done against friction and air resistance, which dissipate energy in the form of heat. This is why her potential energy at the top is less than her initial kinetic energy at the bottom.