Review - KE, GE, Elastic Energy, and Energy Transformations

Kinetic Energy is a type of energy that an object has when it is

• Moving

• At rest

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NGSS.MS-PS3-1

Two factors that affect the amount of KE a moving object has are...

• Speed and Elevation

• Speed and Mass

• Rigidity and Speed

• Mass and Elevation

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NGSS.MS-PS3-1

As the speed of an object INCREASES, then its KINETIC ENERGY will

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NGSS.MS-PS3-1

A moving object with LESS MASS will have _______ KE than a moving object with MORE MASS

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NGSS.MS-PS3-1

Imagine that you are out grocery shopping and are pushing a cart. You push the cart at the same speed the entire time, but fill it up with groceries as you go. When would the cart have more kinetic energy - when it is empty or full? Why?

Answer explanation

The full cart would have more KE because it has more mass than the empty cart. Both carts are moving at the same speed, so the only difference is mass.

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NGSS.MS-PS3-1

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It's wintertime and you are sledding down a steep hill. When do you have more KE, at the top when you start your slide or at the bottom as you finish your slide? Why?

Answer explanation

You have more KE at the bottom because you are moving fastest at the bottom of the hill. This is because you pick up speed as you travel down the hill. Your mass stays the same, so it doesn't affect the amount of KE.

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

You and your friends are sledding on a four-person sled. In the middle of your run, one of you falls off. Does the KE of the sled increase, decrease, or stay the same right after that happens? Why?

Answer explanation

The KE decreases because the sled lost the mass of one person. Less mass means that it has less KE now.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Two factors that affect the amount of Gravitational Energy an object has are...

• Speed and Elevation

• Speed and Mass

• Rigidity and Speed

• Mass and Elevation

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NGSS.MS-PS2-4

An object has Gravitational Energy when it is ______ a surface

• Elevated above

• On top of

• Sliding across

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NGSS.MS-PS3-2

What happens to the speed of an object as it falls?

• It increases

• It decreases

• It stays the same

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NGSS.MS-PS2-4

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