Energy, Work, and Simple Machines
Practice Test
1.
__________ is the rate of doing work.
a.
Effort
b.
Energy
c.
Power
d.
Force
Hint
2.
The equation for work is __________.
a.
W
=
ma
b.
W
=
F
/
m
c.
W
=
F
Δ
KE
d.
W
=
Fd
Hint
3.
If the machine in Figure 10-11a is ideal and an effort force of 7.0 N just lifts a 14.0 N box situated 0.75 m from the pivot, what is the distance from the pivot point to where the effort force is exerted?
a.
0.38 m
b.
1.5 m
c.
2.0 m
d.
65 m
Hint
4.
The ratio of resistance force to effort force is called the __________.
a.
efficiency
b.
torque
c.
power
d.
mechanical advantage
Hint
