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- Energy, Power, And Work
Test Description: Unit Post-test
Instructions: Answer all questions to get your test result.
1) John and MIke both weigh the same but John ran up a flight of stairs faster than Mike. Which statement is correct?
A
Mike had more energy than John.
B
John had more energy than Mike.
C
John used more power than Mike.
D
Mike used more power than John.
2) Evaluate the mechanical advantage of a ramp that is one meter high and four meters long. (Mechanical advantage = input distance / output distance)
A
Two
B
Three
C
One
D
Four
3) When Rick picks up a heavy box and walks it to his car, he is doing work. Why is it work?
A
Matter is destroyed
B
Matter is created
C
Energy is created
D
Energy is transferred
4) What is the difference between energy and power?
A
Energy is how fast an object moves while power is the weight of the object multiplied by its speed.
B
Energy is how long a motion last while power is how much total motion there is.
C
Energy is the amount of work an object can do while power is the amount of work done on the object.
D
Energy is the amount of work done on an object while power is the rate at which the work is done.
5) Define power:
A
Power is the amount of energy contained in an object.
B
Power is the rate at which energy is converted from one form to another.
C
Power is how fast an object can move.
D
Power is the total amount of energy used by an object.
6) Elaine turns on a lamp to do her homework. What did she use energy to produce?
A
atoms
B
work
C
matter
D
mass
7) All simple machines provides mechanical advantage. They reduce the amount of effort needed to ___________.
A
gain energy
B
add energy to a system
C
do work
D
decrease energy
8) Which of the following scenarios is an example of work being done?
A
Pat sitting in a chair
B
Pat leaning on a wall
C
Pat standing up
D
Pat playing tag
9) When a toy car with a spring is wound up, it is ready to move. Why does this happen?
A
The spring uses kinetic energy to move the car.
B
The car stores energy that is released when it moves.
C
The spring stores energy that is released to move the car.
D
The car stores energy that is released to move the spring.
10) When a force is appled to raise a backpack off the floor, it is an example of _______.
A
work
B
potential energy
C
balance
D
gravity
11) Which of the following is an example of energy transfer or work?
A
leaning on a wall
B
a car in the driveway
C
riding a bicycle
D
a ball sitting in the grass
12) A ball moving across a field is an example of work if _______________.
A
it is not sitting still
B
it changes direction
C
it has been moved by a force
D
it moves quickly
*select an answer for all questions
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