Energy Review 1

Once a ball hits a surface, what happens to its energy?

• Its kinetic energy is turned into elastic energy.
• Its energy decreases because it is slowing down.
• Its kinetic energy turns into gravity.

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Why does a racquet ball bounce, but a cat food can does not bounce as much?

• The cat food can is a solid, but the racquet ball is not.
• The racquet ball is lighter than the cat food can.
• The racquet ball is able to be compressed more than the cat food can.

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What determines how much elastic energy an object can have?

• The more an object can be stretched or deformed and still go back to its original shape, the more elastic energy it has.
• The thicker an object the more elastic energy it has.
• The greater the mass of the object the greater it's elastic energy.
• The higher you raise a ball before letting it bounce, the greater elastic energy the ball has.

What questions do you have about elastic energy?

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Using the diagram of a falling object, where would GE be the largest?

• Position A
• Position B
• Position C

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Using the diagram of a falling object, where would KE be the largest?

• Position A
• Position B
• Position C

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Which pie chart best represents the energy of a falling object at position B?

• 
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Where does a pendulum have 100% gravitational energy?

• Position 1 because this it has been elevated up from the reference height.
• Position 3 because gravity is pulling it the most here.
• Positions 1 and 5 because these are the places where it travels the highest.

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Why doesn't the pendulum have any KE at positions 1 and 5?

• Because something can't have GE and KE at the same time.
• Because there is an instant where the pendulum fully stops when changes direction.
• Because KE is only present if objects are moving really fast.

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Where does a pendulum have the greatest speed?

• Position 3 because this is where it has 100% KE.
• Positions 2 and 4 because it is still falling.
• Positions 2, 3, and 4 because this is where it has less GE.

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