Physical Science 8 - Unit EM Extension E Quiz + Em Extension E practice quiz

Suppose you have two tracks side-by-side, each with a low-friction cart at rest on it. Let us call them Cart A and Cart B. You use both your hands to give both carts a quick push at the same time and they both start moving. Which object is involved in two interactions at the same time in this situation? What is its role in each of these interactions energy giver or energy receiver?

B. You (the person) are involved in both interactions, and you are the energy giver. Feedback Statement B is correct. The person (you) pushing the two carts simultaneously is involved in both interactions, and the person is the energy giver, which we know because both carts increase in kinetic energy.

Thinking of the child pushing the toy car on the carpet again from the extension activity. What would happen if the toy car slowed while being pushed? Which of these G/R energy diagrams would be most appropriate for this situation?

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

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

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

Transient state