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Potential Energy
Kinetic Energy
Conservation of Energy
Work & Machines
Vocabulary
100
Potential energy is the ___________.

What is the energy that is stored due to the interactions between objects?

100
Kinetic energy is due to ________.
What is the motion of an object?
100
Matter is not created or destroyed, it is ________ or _______.
What is transferred or converted?
100
In order for work to be done, a force must ______________ an object in the same direction as the force is applied.
what is displace?
100
energy is not created or destroyed, it is transferred or converted
what is the law of conservation of energy?
200

The acceleration due to gravity on earth is equal to ________ m/s2

what is 9.81 m/s2?

200
Which has more kinetic energy, a a car moving at 20 m/s or an 18-wheeler moving at the same speed?
what is an 18-wheeler moving at the same ?
200
As the potential energy of a roller coaster decreases, the kinetic energy _____.
What is increases by an equal amount?
200
A simple machine multiplies your
What is force?
200
energy that is due to the gravitational force between objects
what is gravitational potential energy?
300

Which of the following locations on the roller coaster has the highest gravitational potential energy?

(see PPT slide)

What is location A?

300
At what point in the diagram is the kinetic energy at the highest?
what is position C?
300
The sum of the potential and kinetic energy in a system is ______.
What is mechanical energy?
300

A device that changes the force or increases the motion from work

what is a machine?
300
energy that is stored by compressing or stretching an object
what is elastic potential energy?
400

Potential energy comes in 3 forms. They are _____, _____, and _____.

What is gravitational, elastic, and chemical?

400
What is the potential energy of a car with a mass of 230 kg that is moving at 15 m/s?

What is 25,875 Joules?


KE = (1/2)mv2 = (1/2)(230)(15)2

400
Your friend claims that they have created a machine that runs at 104.5 % efficiency. This is untrue because of ______.
The law of conservation of energy states that you cannot create energy. 
400
One way in which you can increase the efficiency of a machine
what is decrease the friction?
400
the transfer of energy when a force is applied over a distance
what is work?
500
What is the potential energy of a ball that has a mass of 0.5 kg sitting on a table with a height of 2.3 m?

what is 11.28 Joules?


GPE = (.5 kg)(9.81 m/s2)(2.3m) = 11.28 J

500
The kinetic energy of a hog running through a field at 0.5 m/s is 5 joules. It's mass is ______.

what is 40 kg?


KE = (1/2)mv2 


5 = (1/2)(x)(0.5)2

500
one calorie of food is equal to ______ joules of energy.
What is 4,000 Joules?
500
Machines are useful because they can help increase speed, increase force, and ______________.
what is change the direction of the force?
500
the ability to cause change
what is energy?