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Simple Machines
Test Description: Basic information plus input and output of forces
Instructions: Answer all questions to get your test result.
1) With a second class lever, such as a wheelbarrow, in which direction is the input force?
A
right
B
left
C
down
D
up
2) When replacing a light bulb in a lamp, how much force is applied over the distance?
A
large input force over a longer distance
B
large input force over a short distance
C
small input force over a short distance
D
small input force over a longer distance
3) How is mechanical efficiency determined?
A
force times distance
B
work divided by time
C
output force divided by input force times 100
D
output force divided by input force
4) Which of the following is a first class lever?
A
seesaw
B
wheelbarrow
C
crowbar
D
door
5) Which is a third class lever?
A
balance scale
B
ramp
C
crowbar
D
hammer
6) How are the forces compared in the use of a crowbar?
A
input force is downward, output force is upward
B
input and output forces are both upward
C
input force is upward, output force is downward
D
input and output forces are both downward
7) When a machine changes a force's size, what also changes?
A
work
B
distance
C
power
D
direction
8) What does a single pulley change on an object?
A
direction of force
B
total work accomplished
C
amount of force
D
distance you move
9) How can you increase the amount of work done?
A
increase the speed
B
carry the object
C
throw the object
D
increase the distance
10) A machine's mechanical advantage tells you
A
how much force is increased
B
how much distance can be shortened
C
how long it takes to do the work
D
the effectiveness of a machine
11) The Law of Conservation of Energy explains the
A
work lost to friction
B
the difference between work and power
C
machine's advantage
D
machine's efficiency
12) What is the purpose of a machine?
A
to make work easier, changing the amount of work done
B
to do more work in a shorter amount of time
C
to make work easier, but not change the amount of work done
D
to make work harder, but shortening the time needed to do the work
13) What decreases a machine's efficiency?
A
friction
B
power
C
time
D
distance
14) How is a machine's efficiency shown?
A
in percentages
B
in joules
C
in watts
D
in newton-meters
15) If you push a 20N chair across a floor for 15 meters, how much work is done?
A
5 watts
B
300 percent
C
35 newton-meters
D
300 joules
*select an answer for all questions
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