Physical Science: Extension E Quiz

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 continued to get warmer because friction was still affecting them. Which of these G/R energy diagrams would be most appropriate for this situation?

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).

C

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

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