Physics 110 Final Exam Review

1. A 1-kg mass at Earth's surface weighs about

10 N.

5. A ball is moving at 4 m/s and has a momentum of 48 kg∙m/s. What is the ball's mass?

12 kg

2. A 1000-kg car moving at 10 m/s that brakes to a stop in 5 s has an average braking force of

2000 N.

8. A car has a mass of 1000 kg and accelerates at 2 m/s2. What is the magnitude of the force exerted on the car?

2000 N.

4. A 5000-kg freight car crashes into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg freight car?

6 m/s

3. A 2-kg mass weighs 20 N and is held 4 m above the ground. Its potential energy relative to the ground is

80 J.

6. A bucket of cement is raised by a rope at constant speed at a construction site. The upward force on the bucket supplied by the rope is

Equal to the force of gravity.

9. A car that travels twice as fast as another car when braking to a stop will skid

Four times as far.

10. A car traveling at 100 km/h strikes an unfortunate bug that splatters on the windshield. The force of impact is greater on the

Same for both.

7. A can of soft drink will cool faster if placed in what part of a refrigerator?

The freezer compartment.