Unit 5: Energy

How would you describe the relationship between the mass of a car and its kinetic energy?

• As the mass of a car increases, its kinetic energy increases.

• As the mass of a car increases, its kinetic energy decreases.

• As the mass of a car decreases, its kinetic energy increases.

• There is no clear relationship between mass and kinetic energy.

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An example of friction being converted into heat energy is

• the sun.

• a generator.

• a Snickers bar.

• rubbing your hands together.

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A boulder that is resting on the top of a cliff slips over the edge and accelerates towards the ground. As the rock falls, the amount of kinetic energy

• increases

• decreases

• stays the same

• increases then decreases

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Where is the potential energy of the roller coaster the lowest?

• A

• B

• C

• D

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If you start a fire in a fireplace, the logs start to burn. The chemical energy in the logs was changed into

• electrical energy

• mechanical motion

• heat and light energy

• electrical and heat energy

Electrical energy can be transformed into other types of energy. We often experience this transformation of energy in our everyday lives. The example that represents a transformation from electrical to sound energy is

• camp fire

• car

• flashlight

• TV

If you have an electrical circuit with a battery, wires, and a light bulb, what energy transformations take place?

• Electrical energy decreases over time.

• Electrical energy does not affect heat or light.

• Electrical energy can be transformed only into light.

• Electrical energy can be transformed into both heat and light.

You place water in an electric kettle and the water inside starts to boil. What is happening?

• Light energy is transforming into heat.

• Heat energy is transforming into electricity.

• Electrical energy is transforming into heat energy.

• Electrical energy is transforming into light and heat energy.

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Which point on the pendulum's swing represents the minimum potential energy?

• A

• B

• C

• A & C

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Which point on the roller coaster's path represents the maximum potential energy?

• A

• B

• C

• D

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