Chapter 10:
Energy, Work, and Simple Machines
Practice Test
1.
The unit for kinetic energy is the __________.
a.
watt
b.
volt
c.
joule
d.
ampere
Hint
2.
The equation for work is __________.
a.
W = Fd
b.
W
=
F
K
c.
W = ma
d.
W = F/m
Hint
3.
17.An airplane passenger carries a 300.0-N suitcase up the stairs, a displacement of 5.50 m vertically and 3.75 m horizontally. How much work does the passenger do?
a.
1.65 × 10
3
J
b.
1.13 × 10
3
J
c.
2.78 × 10
3
J
d.
165 J
Hint
4.
One __________ is one joule of energy transferred in one second.
a.
calorie
b.
watt
c.
volt
d.
newton
Hint
5.
The force exerted by a machine is called the __________.
a.
mechanical force
b.
resistance force
c.
effort force
d.
mechanical advantage
Hint
6.
A forklift raises a box 2.5 m doing 8.7 kJ of work on it. What is the mass of the box?
a.
3.6 × 10
3
kg
b.
3.5 × 10
3
kg
c.
7.2 × 10
2
kg
d.
3.6 × 10
2
kg
Hint
7.
A student lifts a box of books that weighs 215 N. The box is lifted 1.75 m. How much work does the student do on the box?
a.
123 J
b.
217 J
c.
376 J
d.
38.4 J
Hint
8.
An electric motor lifts an elevator 14.0 m in 22.5 s by exerting an upward force of 1.75 × 10
4
N. What power does the motor produce in kilowatts?
a.
10.9 kW
b.
1.09 × 10
4
kW
c.
245 kW
d.
2.45 × 10
4
kW
Hint
9.
A 16.8-kg boy is riding in a 4.50-kg wagon. A 14.0-kg girl pushes the wagon and exerts a constant force of 2.60 N over a distance of 3.50 m. How much work does the girl do pushing the wagon?
a.
0.26 J
b.
127.4 J
c.
66.4 J
d.
9.10 J
Hint
10.
A sailor pulls a boat 15.0 m along a dock using a rope that makes a 45.0
angle with the horizontal. How much work does the sailor do on the boat if he exerts a force of 185 N on the rope?
a.
1.59 × 10
3
J
b.
2.78 × 10
3
J
c.
1.96 × 10
3
J
d.
1.96 × 10
2
J
Hint
