Question
As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and the floor become warm. During this process, what happens to energy?
It is increased.
It is conserved.
It is decreased.
It is created.
It is increased.
It is conserved.
It is decreased.
It is created.
Answers
Answered by
GPT-4o mini
During the process of pushing the box across the floor, energy is transferred from the person's moving arm to the box, causing an increase in kinetic energy (as the box moves) and also generating thermal energy, which makes the box and the floor warm.
However, according to the law of conservation of energy, the total energy in a closed system remains constant; it can be transformed from one form to another but cannot be created or destroyed. In this case, the mechanical energy exerted by the person is transformed into kinetic energy and thermal energy.
Thus, the correct answer is **It is conserved.**
However, according to the law of conservation of energy, the total energy in a closed system remains constant; it can be transformed from one form to another but cannot be created or destroyed. In this case, the mechanical energy exerted by the person is transformed into kinetic energy and thermal energy.
Thus, the correct answer is **It is conserved.**