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Physical Science Chapter 14
Test Description: Work, Power Machines
Instructions: Answer all questions to get your test result.
1) Work is the product of
A
motion and force
B
power and force
C
speed and force
D
force and distance
2) Which of the following is a unit of work
A
joule
B
horsepower
C
newton
D
watt
3) 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
4.0 N-m
D
2.5 N-m
4) Power is equal to work divided by
A
mechanical advantage
B
time
C
force
D
distance
5) If a machine has a mechanical advantage much larger than 1, its output force is
A
about the same as its input force
B
much less than its input force
C
in the same direction as its input force
D
much larger than its input force
6) How is the work output of a machine related to its work input
A
always zero
B
always equal
C
always less
D
always greater
7) A machine with a 5 N input force and a 25 N output force has a mechanical advantage of
A
5
B
125
C
2
D
20
8) The mechanical advantage of a pulley system depends upon
A
the diameter of the pulley wheels
B
the length of the rope
C
the direction of the input force
D
the number of sections of rope
9) A screw can be considered a type of
A
compound machine
B
lever
C
pulley
D
inclined plane
10) Which is not a simple machine
A
wedge
B
screw
C
lever
D
fulcrum
*select an answer for all questions
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