Unit EM Extension E Quiz

During this situation what type of state was the car in with respect to its kinetic energy?

A. Transient state

While the speed of the toy car was decreasing, what can you say about the tendency of the two interactions involved?

C. The tendency of interaction with the hand to increase the kinetic energy of the cart was weaker than the tendency of the interaction with the carpet to decrease its kinetic energy.

For these questions, consider a third situation associated with the child pushing the toy car across the carpet. Toward the end of the scenario, while still in contact with both the hand and the carpet, the toy car decreased in speed and stopped. Note that during this period the car and the carpet continue to get warmer because friction was still affecting them. Which of these G/R energy diagrams would be most appropriate for this situation? (Note: The situation is described in the Instructions above.)

Energy diagram C

Which of the following would be an appropriate statement of conservation of energy for this situation? (CPE = chemical potential energy, EPE = elastic potential energy, KE = kinetic energy)

Statement C