Introduction To Physical Science

Chapter 14: Work and Simple Machines

Work and Simple Machines

1
The efficiency of all machines is __________.
A)exactly 100 percent
B)less than 100 percent
C)more than 100 percent
D)impossible to calculate
2
What is a sign that work is being done?
A)density
B)motion
C)matter
D)mass
3
A drill bit is an example of which type of machine?
A)screw
B)wheel and axle
C)lever
D)pulley
4
What does a screw consist of?
A)an inclined plane wrapped around a cylinder
B)a wheel and axle in a vertical position
C)a lever wrapped around a pole
D)a wedge wrapped around a pipe
5
When you climb stairs and then walk down a hallway, in which direction is the work done?
A)upward
B)along the hallway
C)in the opposite direction that you walk
D)downward
6
Using an inclined plane allows you to apply __________.
A)a lesser force
B)no force
C)a greater force
D)the same force
7
A chisel is an example of which machine?
A)wedge
B)pulley
C)wheel and axle
D)lever
8
The unit for work is a joule, which is equal to __________.
A)N + m
B)N x m
C)N/m
D)N - m
9
What happens to the total amount of work done when you use a machine compared to not using a machine?
A)It increases.
B)It goes to zero.
C)It decreases.
D)It stays the same.
10
Which is an example of work being done in a scientific sense?
A)lifting a box
B)carrying a box
C)pushing against a stationary box
D)doing homework
11
What is the scientific formula for work?
A)W = F + d
B)W = F - d
C)W = F/d
D)W = F x d
12
A ramp in a building is an example of which machine?
A)lever
B)inclined plane
C)wedge
D)pulley
13
What is transferred when work is done?
A)velocity
B)energy
C)matter
D)mass
14
Which simple machines are found on a hammer?
A)lever only
B)plane and lever
C)wedge and plane
D)screw and pulley
15
When the pyramids were built, blocks were lifted from a quarry and moved across the desert. When was work done in a scientific sense?
A)moving the blocks across the desert
B)when lifting the blocks and when moving them across the desert
C)No work was done in a scientific sense.
D)lifting the blocks
16
Using several pulleys together is known as a __________.
A)wheel and axle
B)pulley system
C)machine system
D)pulley group
17
Mechanical advantage is equal to __________.
A)input force times output force
B)output force divided by input force
C)input force divided by output force
D)output force times input force
18
What happens to the amount of power expended when you are climbing stairs and then climb faster?
A)It stays the same.
B)It stops.
C)It decreases.
D)It increases.
19
On what point does a lever pivot?
A)the end
B)the fulcrum
C)the arm
D)the middle
20
Power is measured by which units?
A)newton-meters
B)joules
C)watts
D)newtons
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