Simple Machines: Question Preview (ID: 17949)

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With a second class lever, such as a wheelbarrow, in which direction is the input force?
a) up
b) down
c) left
d) right

When replacing a light bulb in a lamp, how much force is applied over the distance?
a) small input force over a longer distance
b) large input force over a longer distance
c) small input force over a short distance
d) large input force over a short distance

How is mechanical efficiency determined?
a) force times distance
b) output force divided by input force
c) output force divided by input force times 100
d) work divided by time

Which of the following is a first class lever?
a) wheelbarrow
b) crowbar
c) seesaw
d) door

Which is a third class lever?
a) crowbar
b) hammer
c) balance scale
d) ramp

How are the forces compared in the use of a crowbar?
a) input and output forces are both downward
b) input force is downward, output force is upward
c) input and output forces are both upward
d) input force is upward, output force is downward

When a machine changes a force's size, what also changes?
a) power
b) work
c) direction
d) distance

What does a single pulley change on an object?
a) direction of force
b) distance you move
c) amount of force
d) total work accomplished

How can you increase the amount of work done?
a) increase the distance
b) increase the speed
c) carry the object
d) throw the object

A machine's mechanical advantage tells you
a) how much distance can be shortened
b) how much force is increased
c) how long it takes to do the work
d) the effectiveness of a machine

The Law of Conservation of Energy explains the
a) the difference between work and power
b) machine's advantage
c) machine's efficiency
d) work lost to friction

What is the purpose of a machine?
a) to make work easier, but not change the amount of work done
b) to make work easier, changing the amount of work done
c) to make work harder, but shortening the time needed to do the work
d) to do more work in a shorter amount of time

What decreases a machine's efficiency?
a) time
b) distance
c) friction
d) power

How is a machine's efficiency shown?
a) in joules
b) in percentages
c) in watts
d) in newton-meters

If you push a 20N chair across a floor for 15 meters, how much work is done?
a) 5 watts
b) 35 newton-meters
c) 300 joules
d) 300 percent

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