Energy Unit 6 Lesson 5

Suppose the skater is at the highest point in the jump and she pauses in air for a moment. What are the relative amounts of the skater’s kinetic energy and gravitational potential energy at that point?

• all kinetic energy, no gravitational potential energy

• half kinetic energy, half gravitational potential energy

• no kinetic energy, all gravitational potential energy

• no kinetic energy, no gravitational potential energy

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Which of the following statements about the kinetic energy and potential energy of the skater are true?

• As the skater rolls up the side of the half-pipe, the skater gains kinetic energy.

• The skater has the most gravitational potential energy at the bottom of the half-pipe.

• Gravitational potential energy transforms into kinetic energy when the skater rolls down the side of the half-pipe.

• The skater transfers gravitational potential energy to the skateboard.

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Eating a healthy breakfast gives your body the energy needed to help you start your day. The girl in the photo is having cereal and orange juice, which have stored ___________

energy, a form of potential energy.

• chemical

• nuclear

• electric

• electromagnetic

Two cars are driving down the road. Car A has a mass of 1,100 kg and is moving at 20 m/s. Car B is has a mass of 1,000 kg and is moving at 30 m/s. Which car has more kinetic energy and why?

• car A because it has more mass and almost the same speed as car B

• car B because it has a greater speed and almost the same mass as car A

• car A because it has a lower speed and almost the same mass as car B

• car B because it has less mass and almost the same speed as car A

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What is energy?

• the ability to cause changes in matter

• the mass of an object

• the size of an object

• the weight of an object

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Which of these is NOT a form of energy?

• heat

• mass

• light

• sound

Which of the following does NOT have kinetic energy?

• a rolling ball

• an object at rest on a shelf

• a speeding car

• a swinging baseball bat

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The gravitational potential energy of an object is determined by

• the mass of the object

• the height of the object above the ground

• the volume of the object

• the weight of the object

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As this pendulum swings from point 1 to point 5, at which point is its KINETIC energy highest? (Another way to think of it is when is it moving the fastest.)

• 1

• 2

• 3

• 4

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As a pendulum swings from point 1 to point 3, what happens to its kinetic and potential energy?

• Both the potential energy and kinetic energy decrease

• The potential energy decreases while the kinetic energy increases

• The kinetic energy decreases while the potential energy increases

• Both the potential energy and kinetic energy increase

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