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.