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Work, Power, And Energy
Test Description: Review of work, power, and energy
Instructions: Answer all questions to get your test result.
1) The transfer of energy to a body by the application of a force that causes the body to move in the direction of the force is called
A
distance
B
mechanical advantage
C
power
D
work
2) A boy exerts an average force of 65N when he lifts a box 1.2m. How much work does he do?
A
54J
B
0 J
C
78J
D
66J
3) _______ is defined as the rate at which work is done.
A
joule
B
mechanical advantage
C
speed
D
power
4) How much power is required to do 180 J of work in 2.4s?
A
178W
B
7.5W
C
430W
D
75W
5) How much power is required to lift a 30N chair .20m in 2s?
A
15W
B
1.0W
C
3.0W
D
12W
6) A boy pushes on a parked car with a force of 200N. The car does not move. How much work does the boy do?
A
None of the above.
B
200N
C
200J
D
0 N
7) What are the units of work?
A
m/s
B
kg x m/s
C
W
D
J
8) A weightlifter presses a 400N weight 0.5m over his head in 2s. What is the power of the weightlifter?
A
25W
B
400W
C
100W
D
100N
9) Which of the following processes requires the most work?
A
A person lifts a 1kg weight 1m off the floor.
B
A person holds a 1kg weight stationary with outstretched arms.
C
A 10kg weight rests on a table.
D
A person lifts a 10kg weight 1m off the floor.
10) A man pushes a crate along a factory floor by exerting a force of 55N. If the crate moves a distance of 4m, how much work does the man perform?
A
145J
B
220N
C
165N
D
220J
11) What are the units of power?
A
joules per second
B
watts
C
all the choices are correct
D
horsepower
12) In which of the situations is NO work being done?
A
carrying a box up a flight of stairs
B
pushing a box across the floor
C
holding a box overhead
D
lifting a box from the ground to a table top
13) The amount of work being done on an object can be increased by
A
decreasing the distance the object is moved.
B
increasing the distance the object is moved.
C
increasing the speed the object is moved.
D
decreasing the speed the object is moved.
14) Power output can be increased by
A
decreasing the amount of time in which work is done
B
decreasing the force exerted on an object
C
decreasing the work done on the obect.
D
increasing the amount of time in which work is done.
15) __________ is the measure of the ability to do work.
A
respiration
B
photosynthesis
C
power
D
energy
16) As a dropped penny falls toward the ground, ____ energy is converted to ____ energy.
A
mechanical, chemical
B
potential, kinetic
C
kinetic, potential
D
kinetic, heat
17) The law of conservation of energy states that energy
A
can only be converted into heat.
B
cannot be created or destroyed
C
is always equal and opposite
D
is created from motion.
18) Which of the following has the greatest potential energy?
A
a person standing on top of a hill
B
a bowling ball falling from a 10-story building
C
a car parked at the top of a hill
D
a car rolling down a hill
19) What is kinetic energy?
A
energy available to a stationary object
B
energy stored within an object
C
energy an object creates
D
energy an object has due to its motion
20) Potential energy is
A
energy stored in an object
B
All of the above.
C
energy an object has due to its position.
D
dependent upon position, shape/size/mass, condition, etc.
*select an answer for all questions
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