Use the equations on the board to answer the following questions.
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Question 1
1.
Work is performed when
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4
Question 2
2.
Match the following vocabulary words to their definition.
Kinetic energy
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the ability to do work
Gravitational potential energy
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energy that an object has due to its motion
Energy
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the law that states that energy cannot be created or destroyed but can be changed from one form to another
Law of conservation of energy
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the potential energy of an object due to its height, or its position relative to the earth's surface
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Question 3
3.
It took a 36,000 N force to make a car move 1,500 meters. How many Joules of work is performed to make the car move?
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Question 4
4.
An elevator lifts a load of passengers with a force of 156,000 N and does 2,550,000 J of work. How many meters did the elevator transport passengers?
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Question 5
5.
Order the following from most kinetic energy to least.
1,900 kg car traveling at 10 meters/second
181 kg motorcycle traveling at 10 meters/second
6,300 kg elephant traveling at 10 meters/second
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Question 6
6.
A dog runs through the school at 5.6 m/s and has a mass of 40 kg. what is the dog's kinetic energy?
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Question 7
7.
Quarter Horses are typically faster than Thoroughbreds over short distances. A racehorse can run at 18 m/s and has 195,000 J of kinetic energy. What is this racehorse's mass?
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Question 8
8.
How much potential energy does a squirrel up in a tree have? The squirrel has a mass of approximately 3 kg and is 14 meters high.
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Question 9
9.
A city sets up a hydroelectric dam and they need about 25,000,000 J of energy produced every second. What is the mass of water that is necessary to create that kind of potential energy, if the dam is 42 meters high?
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4
Question 10
10.
Categorize the examples below as either potential energy or kinetic energy.
An apple hanging from a tree
A jack in the box before it's released
A boulder rolling down a hill
A soccer ball moving across the field after it's been kicked
A book sitting on a shelf
A boulder sitting at the top of a hill
A roller coaster moving at the bottom of a hill
A baseball player swinging a bat
Potential Energy
Kinetic Energy
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Question 11
11.
At what point does the object have the most potential energy?
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1
Question 12
12.
At what point does the object have the most kinetic energy?
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1
Question 13
13.
As Bob jumps off the couch, his potential energy equals 50 J. What is his kinetic energy if his total mechanical energy is still 150 J?
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1
Question 14
14.
If the power rating of a incandescent light bulb is 60 Watts, then how much time does it take the light bulb to run to acheive 120 J of work?
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Question 15
15.
Someone wearing skates on a horizontal surface is pushed by a friend with a force of 65 N. How far must the student be pushed in 30 seconds, so that her power is 352 W?