Work and Simple Machines
Practice Test
1.
Power is measured by which units?
a.
joules
b.
newtons
c.
newton-meters
d.
watts
Hint
2.
What is transferred when work is done?
a.
velocity
b.
energy
c.
mass
d.
matter
Hint
3.
What is the mechanical advantage if 50 J are put in and 200 J are produced?
a.
50
b.
4
c.
1000
d.
200
Hint
4.
A chisel is an example of which machine?
a.
pulley
b.
lever
c.
wedge
d.
wheel and axle
Hint
5.
How do input force and output force relate to each other?
a.
They are unrelated.
b.
They are the same.
c.
The input is always less than the output.
d.
They are always different.
Hint
6.
A drill bit is an example of which type of machine?
a.
pulley
b.
screw
c.
wheel and axle
d.
lever
Hint
7.
Mechanical advantage is equal to __________.
a.
input force times output force
b.
input force divided by output force
c.
output force times input force
d.
output force divided by input force
Hint
8.
Name the four simple machines.
a.
plane, lever, screw, and wedge
b.
wedge, lever, pulley, and wheel
c.
screw, lever, wedge, and plane
d.
inclined plane, lever, wheel and axle, and pulley
Hint
9.
What is the scientific formula for work?
a.
W = F + d
b.
W = F/d
c.
W = F - d
d.
W = F x d
Hint
10.
Using an inclined plane allows you to apply __________.
a.
a lesser force
b.
the same force
c.
no force
d.
a greater force
Hint
11.
What does a screw consist of?
a.
a wedge wrapped around a pipe
b.
an inclined plane wrapped around a cylinder
c.
a wheel and axle in a vertical position
d.
a lever wrapped around a pole
Hint
12.
A ramp in a building is an example of which machine?
a.
lever
b.
wedge
c.
inclined plane
d.
pulley
Hint
13.
What happens to the total amount of work done when you use a machine compared to not using a machine?
a.
It decreases.
b.
It increases.
c.
It goes to zero.
d.
It stays the same.
Hint
14.
Which of the following do you think a wheel and axle is most closely related to?
a.
inclined plane
b.
wedge
c.
pulley
d.
lever
Hint
15.
Which is an example of work being done in a scientific sense?
a.
pushing against a stationary box
b.
lifting a box
c.
doing homework
d.
carrying a box
Hint
16.
A 5,000 N block was lifted 10 m. How much work was done?
a.
5,000 J
b.
50,000 J
c.
500 J
d.
50 J
Hint
17.
On what point does a lever pivot?
a.
the fulcrum
b.
the middle
c.
the end
d.
the arm
Hint
18.
Using several pulleys together is known as a __________.
a.
machine system
b.
pulley system
c.
pulley group
d.
wheel and axle
Hint
19.
What happens to the amount of power expended when you are climbing stairs and then climb faster?
a.
It increases.
b.
It decreases.
c.
It stays the same.
d.
It stops.
Hint
20.
What is a sign that work is being done?
a.
matter
b.
motion
c.
density
d.
mass
Hint
