Title: Summative Assessment
Course: MNPCC Physics > Section: Energy

Use this quiz to make sure you understand everything you are supposed to from this unit.

Q: The following diagram shows a the path of a projectile.  At what point does the pendulum have the highest gravitational potential energy?
- Position A and C are equivalent. (They are but they are not the highest.)
- Position A (Not the highest.)
- Position B (Correct.)
- Position C (C is not the highest.)
A: Position B
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: The following diagram shows a the path of a projectile.  At what point does the pendulum have the highest kinetic energy?
- Position A and C are equivalent. (Correct.)
- Position A (A and C are equivalent.)
- Position B (B would have the least.)
- Position C (A and C are equivalent.)
A: Position A and C are equivalent.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Two identical cars, A and B, are travelling down the highway.  A is moving at 30 m/s and B is moving at 15 m/s.  Both brake until their speeds are 0 m/s.  How will the temperature of their brakes compare?
- A's change in temperature will be twice as big as B's. (Energy is related to velocity squared.)
- A's temperature change will be four times that of B. (Correct.)
- They will have the same positive temperature change. (A will change more as it had been going faster.)
- They will have the same negative temperature change. (The kinetic energy is decreasing, so something else has to increase.)
- Neither will change temperature. (The kinetic energy is decreasing, so something else has to increase.)
A: A's temperature change will be four times that of B.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: The diagram below shows 3 possible forces, each having the same horizontal magnitude. on a box that is moving to the right.  Which force would be doing the most amount of work on the box?
- Force C (Only the component in the direction of motion matters. So they are all the same.)
- Force B (Only the component in the direction of motion matters. So they are all the same.)
- Force A (Only the component in the direction of motion matters. So they are all the same.)
- All 3 are identical. (Correct.)
A: All 3 are identical.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which statement best describes what happens to energy when one moving cart hits a second stationary cart and they both move off at half the original speed.
- The energy of the first cart decreases as the energy of the second cart increases. (Correct.)
- The kinetic energy of the system decreases as the carts are moving slower after collision than before. (After collision, more mass is moving, so energy is conserved.)
- The energy of the system increases as two carts are moving after the collision, compared to one before. (Energy is conserved.)
A: The energy of the first cart decreases as the energy of the second cart increases.
If right: Your answer is correct.
If wrong: Your answer is incorrect.