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Work, Power, And Efficiency
Test Description: Concept and calculating Work Power and Efficiency
Instructions: Answer all questions to get your test result.
1) Work is done when a _____ is exerted on an object and the object moves a _____.
A
force, distance
B
force, force
C
force, time
D
distance, force
2) Work =
A
force ·distance
B
time ·distance
C
force ·gravity
D
force ·time
3) When you hold something, are you exerting a force on the object?
A
no
B
yes
4) When you hold something, are you doing work?
A
yes
B
no
5) If you set the object on a table, does the table exert a force on the object?
A
yes
B
no
6) ___cannot be greater than ___ due to friction.
A
Work in , Work out
B
Work out, Work in
7) ___cannot be greater than ___ due to friction.
A
Work in, Efficiency
B
Efficiency, 0%
C
Efficiency, 100%
D
Work out, Efficiency
8) ___the ratio of work output to work input.
A
Power
B
Work
C
Efficiency
9) ____the rate at which work is done.
A
Work
B
Power
C
Efficiency
10) A father lifts his daughter repeatedly in the air. How much work does he do with each lift, assuming he lifts her 2.0 m and exerts an average force of 190 N?
A
95 W
B
380 J
C
95 J
D
380 W
11) If two objects do the same amount of work, but one does it in less time.
A
The lighter one has more power.
B
The heavier one has more power.
C
The slower one has more power.
D
The faster one has more power.
12) A watt is the amount of power required to
A
do 1 W of work in 1 s
B
move 1 kg over 1 m
C
do 1 J of work in 1 s.
13) A weight lifter does 686 J of work on a weight that he lifts in 3.1 seconds. What is the power with which he lifts the weight?
A
221 W
B
0.0045 W
C
2126.6 W
14) Mechanical advantage is
A
the ratio between output force and input force
B
the ratio between input force and output force
C
the ratio between effort force and efficiency force
15) A roofer needs to get a stack of shingles onto a roof. Pulling the shingles up manually used 1549 N of force. Using a system of pulleys requires 446 N. What is the mechanical advantage?
A
3.47
B
29%
C
0.29
D
347
16) What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J of work are done by the machine?
A
386%
B
25.9 J
C
25.9 %
D
0.259%
*select an answer for all questions
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