Physical Science Chapter 14 Question Preview (ID: 36224)


Work, Power Machines. TEACHERS: click here for quick copy question ID numbers.

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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