Question Set on Work and Power, Motion and Forces

Chapter 4 First Half

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1. A net force of 5.0 N moves a 2.0-kg object a distance of 3.0 m in 3.0 s. How much work is done on the object?
a.
1.0 J
c.
10. J
b.
30. J
d.
15 J

2. A 0.50-kg sphere at the top of an incline has a potential energy of 6.0 J relative to the base of the incline. Rolling halfway down the incline will cause the sphere’s potential energy to be:
a.
12 J
c.
3.0 J
b.
6.0 J
d.
0 J

3. Which mass has the greatest potential energy with respect to the floor?
a.
2-kg mass 10 m above the floor
c.
50-kg mass resting on the floor
b.
6-kg mass 5 m above the floor
d.
10-kg mass 2 m above the floor

4. Which graph best represents the relationship between potential energy (PE) and height above ground (h) for a freely falling object released from rest?
a.

c.

b.

d.

5. As an object falls freely in a vacuum:
a.
the speed of the object decreases.
b.
the kinetic energy of the object remains the same.
c.
the total energy of the object remains the same.
d.
the potential energy of the object increases.

6. As the speed of a bicycle moving along a level horizontal surface changes from 2 m/s to 4 m/s, the magnitude of the bicycle's:
a.
total energy remains the same.
b.
kinetic energy decreases.
c.
gravitational potential energy remains the same.
d.
kinetic energy remains the same.

7. Three people of equal mass climb a mountain using paths A, B, and C shown in the diagram below. Along which path(s) does a person gain the greatest amount of gravitational potential energy from start to finish?

a. path A, only
c.
path C, only
b.
path B, only
d.
The gain is the same along all paths.

8. If the velocity of an automobile is doubled, its kinetic energy:
a.
decreases to one-half.
c.
decreases to one-fourth.
b.
doubles.
d.
quadruples.

9. The diagram below represents a