Kinetic and Potential Energy Intro

Where is kinetic energy at its minimum?

• Z

• W

• X

• Y

Answer explanation

At the very highest point since this is where the energy is completely in the form of Potential Energy.

A roller coaster is constantly converting PE to KE and back. but why does it slow down as it goes through the course? Mark all that apply.

• Friction with the track slows it down.

• Friction with the air slows it down.

• The people are breathing the air which slows it down

• The Potential Energy slows the cars down.

Answer explanation

Any type of Friction will convert some of the KE and PE energy into useless heat.

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What will happen if a roller coaster (or skater) does not have enough energy to go over the top of a hill?

• It will stop.

• It will roll back down hill.

• I It will turn over and dump the people out

• I will just keep going forward slowly

Answer explanation

It is called roll back. The car doesn't have enough energy to make it over so it rolls back.

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A 6kg cat misjudges a jump and falls 5 meters. How much gravitational potential energy does the cat have? (The cat is fine by the way.)

• 300 J

• 180000 J

• 1225 J

• 3920000 J

Answer explanation

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A 50kg person is running at 7m/s (about 16 mph). How much kinetic energy do they have?

• 1225 J

• 180000 J

• 294 J

• 3920000 J

Answer explanation

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• At the top of the slide
• At the bottom of the slide

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At which point on the roller coaster does the cart experience about equal amounts of potential AND kinetic energy?

• 1

• 2

• 3

• 4

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• W
• X
• Y
• Z

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• 1
• 2
• 3
• 4

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• 1
• 2
• 3
• 4

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