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Chapter 9.3 Review (7th)
Test Description: Conservation of Energy
Instructions: Answer all questions to get your test result.
1) A force that opposes motion between two surfaces that are touching
A
gravity
B
energy
C
friction
D
efficient
2) A comparison of the amount of energy before a conversion with the amount of useful energy after a conversion
A
energy efficiency
B
conversion
C
system
D
ratio
3) Perpetual motion is impossible because
A
energy is lost.
B
machines have friction.
C
things tend to slow down.
D
machines are very inefficient.
4) Whenever one form of energy is converted into another, some of the original energy is always converted into which type of energy?
A
light
B
sound
C
thermal
D
kinetic
5) On a roller coaster, where is the potential energy the greatest?
A
at the top of the second hill
B
at the top of the first hill
C
at the bottom of the first hill
D
at the bottom of the second hill
6) When a group of objects move energy only to each other, you have a(n)
A
Law of Conservation of Energy
B
Closed System
C
Thermal
D
Energy
7) The total amount of ______________________________ in a closed system is always the same.
A
Thermal
B
Law of Conservation of Energy
C
Energy
D
Closed System
8) shape of a car that helps it be more energy efficient
A
energy efficiency
B
aerodynamic
C
closed system
D
friction
9) rule that states that energy cannot be created or destroyed
A
energy efficiency
B
aerodynamic
C
law of conservation of energy
D
closed system
10) When there is friction on a roller coaster, some of the potential energy is not converted into
A
chemical energy
B
light energy
C
nuclear energy
D
kinetic energy
11) Whenever one form of energy is converted into another, some of the original energy is always converted into which type of energy?
A
thermal
B
sound
C
kinetic
D
light
12) When a roller coaster moves, what helps to overcome friction?
A
energy
B
movement
C
friction
D
current
13) When energy is converted, what type of energy is wasted?
A
thermal energy
B
sound energy
C
kinetic energy
D
light energy
14) What is a perpetual motion machine?
A
a machine that stops running
B
a machine that slows down
C
a machine that runs forever
D
a machine that speeds up
15) this is a comparison of the amount of energy before a conversion with the amount after
A
thermal energy
B
energy efficiency
C
friction
D
shape of the car
16) this is reduced with a better shaped car
A
thermal energy
B
energy efficiency
C
friction
D
shape of the car
17) this helps cars use energy in a more useful way
A
friction
B
shape of the car
C
energy efficiency
D
thermal energy
*select an answer for all questions
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