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Work, Power, And Energy
Test Description: Test Review
Instructions: Answer all questions to get your test result.
1) A force acting on an object does no work if
A
the force is not in the direction of the object's motion
B
the force is greater than the force of friction
C
a machine is used to move the object
D
the object accelerates.
2) If you exert a force of 10.0 N to lift a box a distance of 0.75 m how much work do you do?
A
10.75 J
B
0.075 J
C
7.5 J
D
75 J
3) If you perform 30 J of work lifting a 20 N box from the floor to a shelf how high is the shelf?
A
2 m
B
1.5 m
C
0.5 m
D
0.6 m
4) The standard (SI) unit of power is
A
Horsepower
B
Joule
C
Watt
D
N
5) Why does friction decrease the efficiency of a machine ?
A
It reduced the speed of a machine
B
It increases the input energy of a machine
C
It increases the force of a machine
D
It converts some input energy into thermal energy
6) Reducing friction in a machine
A
decreases its actual mechanical advantage
B
Increases its efficiency
C
increases its ideal mechanical advantage
D
decreases the work output
7) An inclined plane reduces the effort force by
A
increasing the work
B
reducing the work
C
increasing the distance through which the force is applied
D
reducing the effort distance
8) A machine does work, it can do all of the following except
A
change the direction of a force
B
change the amount of work done.
C
change the size of the force needed
D
change the distance the force is applied
9) As the temperature of an object rises so does the
A
thermal energy of the object
B
potential energy of the object
C
Both 1 and 3
D
kinetic energy of the object
10) Which of the following increases when an object becomes warmer
A
thermal energy
B
Chemical energy
C
nuclear energy
D
elastic potential
*select an answer for all questions
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