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NAME: _______________________________ DATE: ____________
Power and Energy Test B
MULTIPLE CHOICE
______ 1- A moving bicycle has?
(3) potential energy
(1) kinetic energy. (2) chemical energy
(4) nuclear energy.
______ 2- When a tennis player hits a ball, the tennis player?
(1) does work on the ball.
(2) gives the ball energy
(3) produces radiant energy
(4) answers 1 and 2 are correct.
______ 3- A flowing stream of water is an example of?
(1) kinetic energy
(2) chemical energy
(3) potential energy
(4) nuclear energy
______ 4- Because of friction?
(1) energy is always conserved. (2) energy is not lost.
(3) all energy is lost.
(4) some potential energy turns into heat
______ 5- What type of energy transformation is represented in the diagram below?
(1) chemical energy to sound energy
(2) sound energy to electric energy
(3) sound energy to chemical energy
(4) electric energy to sound energy
______ 6- An objects kinetic energy can be increased by increasing it's?
(1) speed
(2) power
(3) mass (4) answers 1 & 3.
______ 7- The best example of an object that possesses potential energy is?
(1) a falling rock
(2) a piece of coal (3) a rolling rock
______ 8- Power is scientifically defined as the?
(1) ability to do work. (2) rate at which work is done.
(3) energy of position. (4) energy in motion
______ 9- As a skateboarder goes down a hill, some of the skateboarders energy is?
(1) kinetic
(2) potential
(3) electrical
(4) answers 1 & 2 are correct.
_____ 10- What type of energy is contained in gasoline?
(1) potential
(2) mechanical (3) kinetic (4) sound
_____ 11- In the diagram below, a skier is about to start a slide (position 1), ski down
the hill (2), and STOP (3). At which position would the skier have the most
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kinetic energy?
1
(1) 1 (2) 2
(3) 3
2
Hill
3
Questions 12 and 13 refer to the following activity.
Angie stretches a large rubber band and then releases one of its ends. The rubber band
snaps back to its original shape.
_____ 12- When the rubber band was stretched, it had
(1) kinetic energy (2) potential energy (3) motion energy (4) no energy
_____ 13- As the rubber band was snapping back, it had
(1) no energy
(2) position energy
(3) potential energy
(4) kinetic energy
_____ 14- Power is measured in?
(1) Joules
(2) grams
(3) Watts
(4) Newton-meters
_____ 15- Which item transforms 100% of the energy it receives into useful energy?
(1) window fan
(2) Battery-powered flashlight
(3) hair dryer
(4) none of the items.
Thinking and Analyzing
Questions 16 and 17 refer to the following activity. In an effort to break a strip of
aluminum metal, Charles bent it back and forth many times. He was surprised to notice
the aluminum getting warm at the point of the bend.
_____ 16. This is an example of a transformation of
(1) heat energy to mechanical energy
(2) chemical energy to mechanical energy
(3) mechanical energy to heat energy
_____ 17. The heating of the metal strip in this case
(1) is a gain of energy
(2) is the creation of energy
(3) is the loss of energy
(4) is an unusable energy transformation
_____ 18. The diagram below represents three appliances that transform electric
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Mr. Vorstadt
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energy into mechanical energy. The three items that best fit into boxes A,
B, and C are the
Item A
Electrical Energy
Item B
Mechanical Energy
Item C
(1) vacuum cleaner, table saw, fan
(3) radio, clock, fan
(2) television, fan, refrigerator
(4) lawn mower, hair dryer, generator
Questions 19-21 refer to the following diagram.
Lighting matches in a matchbook
illustrates several different
energy transformations
_____19- When you strike a match on the rough strip of a matchbook cover, you
transform
(1) mechanical energy to heat energy
(2) mechanical energy to chemical energy
(3) mechanical energy to electric energy
(4) heat energy to chemical energy
_____ 20- The matches in the matchbook contain
(1) potential chemical energy (2) potential light energy
(3) potential heat energy
(4) kinetic heat energy
_____21- The burning match involves the transformation of
(1) chemical energy to light and sound energy
(2) chemical energy to light and heat energy
(3) chemical energy to heat energy, only
(4) heat energy to light energy, only
FORMULAS
Kinetic energy (KE) = ½ mv2
Intermediate Science
Mr. Vorstadt
Joules (J)
Page 3
Potential energy (PE) = force x distance
________ 22- 40kg bicycle moving at 2 m/s has a KE of?
________ 23- A 20 N rock that is 12 meters above the ground has a PE of?
________ 24- If you push a 20kg cart at 2m/s, the carts KE is?
________ 25- A 10kg ball moving at 2m/s is has a kinetic energy of?
________ 26- If you push a 30kg wheelbarrow at 2m/s, the wheelbarrows KE is?
________ 27- If a 100N rock is pushed up a 3 meter hill the rock's potential energy is?
Power = energy/time = Watts (W)
Work = power x time = Joules (J)
________ 28- A toy that supplies 20 watts of power moves for 5 sec. has done of work.
________ 29- A light that supplies 200W of power for 10sec has done how much work?
________ 30- If a person does 4,000 joules of work in 20 min, the person's power is?
________ 31- A person who does 500 joule of work in 100 seconds has of power.
DIAGRAMS: Use the diagrams below to complete questions 32-36.
32- If the bicycle's potential energy will be 2,000 J at point C,
the hill is ___________ high.
33- At point B, some of the bicycles kinetic energy will be changed
C
to _____________________ .
34- If the bicycle is moving at point A, its kinetic energy is
Circle one (Greater or Less) than its potential energy.
35- The bicycle's potential energy at point A is ___________ .
B
36- If the bicycle is stopped at point C, it's
kinetic energy would be __________ .
A
200N
Potential energy- can also be stored by changing the shape of an object. Stretching a
rubber band or spring is a way to store potential energy. This energy is released when
the object snaps back to its original shape.
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Directions For each question, write your answer in the spaces provided.
37. How is potential energy stored in an object? _______________________________
______________________________________________________________________
______________________________________________________________________
38. Which has greater kinetic energy, a car going 30 mph or one going 40 mph energy?
Explain. ____________________________________________________________
______________________________________________________________________
______________________________________________________________________
39. Which has greater potential energy, a roller coaster at the top of a hill, or a roller
coaster at the bottom of a hill? Explain. ____________________________________
______________________________________________________________________
______________________________________________________________________
40-41 List two transformations that occur when someone rings a bell?
ONE=___________________________________________________________
____________________________________________________
_____________________________________________________________
__________________________________________________________________
__________________________________________________________________
TWO=___________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
Base your answers to questions 42 and 43 on the diagram of a moving car below and
on your knowledge of science. The diagram shows energy transformations.
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_____42 What is the sequence of the energy transformations represented in the
diagram?
A mechanical chemical solar
B solar electrical mechanical
C mechanical electrical solar
D solar
chemical electrical
43 State one advantage to the environment of using the car shown in the diagram
instead of a car powered by fossil fuel.
______________________________________________________________________________
______________________________________________________________________________
THAT’S ALL FOLKS
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Mr. Vorstadt
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