Glencoe Science Level Green

Chapter 20: Work and Simple Machines

Work and Simple Machines

1.
A drill bit is an example of which type of machine?
A)screw
B)lever
C)pulley
D)wheel and axle
2.
On what point does a lever pivot?
A)the fulcrum
B)the arm
C)the middle
D)the end
3.
What is a sign that work is being done?
A)density
B)matter
C)motion
D)mass
4.
What happens to the amount of power expended when you are climbing stairs and then climb faster?
A)It increases.
B)It stays the same.
C)It stops.
D)It decreases.
5.
A ramp in a building is an example of which machine?
A)wedge
B)lever
C)inclined plane
D)pulley
6.
Name the four simple machines.
A)inclined plane, lever, wheel and axle, and pulley
B)wedge, lever, pulley, and wheel
C)plane, lever, screw, and wedge
D)screw, lever, wedge, and plane
7.
What does a screw consist of?
A)a wheel and axle in a vertical position
B)an inclined plane wrapped around a cylinder
C)a wedge wrapped around a pipe
D)a lever wrapped around a pole
8.
What is the mechanical advantage if 50 J are put in and 200 J are produced?
A)4
B)1000
C)50
D)200
9.
Using an inclined plane allows you to apply __________.
A)no force
B)the same force
C)a lesser force
D)a greater force
10.
When you climb stairs and then walk down a hallway, in which direction is the work done?
A)downward
B)upward
C)along the hallway
D)in the opposite direction that you walk
11.
Which of the following do you think a wheel and axle is most closely related to?
A)lever
B)wedge
C)pulley
D)inclined plane
12.
The efficiency of all machines is __________.
A)more than 100 percent
B)exactly 100 percent
C)impossible to calculate
D)less than 100 percent
13.
Using several pulleys together is known as a __________.
A)pulley system
B)machine system
C)wheel and axle
D)pulley group
14.
What happens to the total amount of work done when you use a machine compared to not using a machine?
A)It stays the same.
B)It goes to zero.
C)It decreases.
D)It increases.
15.
Which simple machines are found on a hammer?
A)wedge and plane
B)lever only
C)plane and lever
D)screw and pulley
16.
Which is an example of work being done in a scientific sense?
A)carrying a box
B)pushing against a stationary box
C)lifting a box
D)doing homework
17.
A 5,000 N block was lifted 10 m. How much work was done?
A)50,000 J
B)500 J
C)5,000 J
D)50 J
18.
A chisel is an example of which machine?
A)wheel and axle
B)wedge
C)lever
D)pulley
19.
What is the scientific formula for work?
A)W = F x d
B)W = F + d
C)W = F - d
D)W = F/d
20.
The unit for work is a joule, which is equal to __________.
A)N/m
B)N - m
C)N + m
D)N x m
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