Physical Science Chapter 14 Question Preview (ID: 36224)
Work, Power Machines.
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Work is the product of
a) speed and force
b) power and force
c) force and distance
d) motion and force
Which of the following is a unit of work
a) joule
b) horsepower
c) watt
d) newton
How much work, in N-m, is done when a 10 N force moves an object 2.5 m
a) 0.25 N-m
b) 25 N-m
c) 2.5 N-m
d) 4.0 N-m
Power is equal to work divided by
a) time
b) force
c) distance
d) mechanical advantage
If a machine has a mechanical advantage much larger than 1, its output force is
a) much larger than its input force
b) much less than its input force
c) about the same as its input force
d) in the same direction as its input force
How is the work output of a machine related to its work input
a) always less
b) always greater
c) always equal
d) always zero
A machine with a 5 N input force and a 25 N output force has a mechanical advantage of
a) 2
b) 5
c) 20
d) 125
The mechanical advantage of a pulley system depends upon
a) the diameter of the pulley wheels
b) the length of the rope
c) the number of sections of rope
d) the direction of the input force
A screw can be considered a type of
a) lever
b) inclined plane
c) pulley
d) compound machine
Which is not a simple machine
a) wedge
b) screw
c) lever
d) fulcrum
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