Unit 7: Energy Transformation Review

Is energy being transferred in either of the following scenarios? Scenario 1: A spring is used to roll a ball across the floor. Scenario 2: You place a cold spoon in a cup of hot water.

• Energy is NOT transferred in either of the scenarios.

• Energy is transferred in Scenario 1 but NOT in scenario 2

• Energy is transferred in both scenarios.

• Energy is transferred NOT transferred in Scenario 1 but is transferred in Scenario 2.

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Which of the following best describes the energy transformations that occur in the picture?

• Chemical energy to electrical energy to mechanical energy to thermal energy

• Thermal Energy to mechanical energy to chemical energy to electrical energy.

• Electrical energy to chemical energy to mechanical energy to thermal energy.

• Electrical energy to mechanical energy to thermal energy to chemical energy.

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If the simple motor is connected properly, the coil of coper wire spins. Which of the following descriptions is correct energy transformation that takes place between the paper clip and the spinning coil?

• Chemical energy is transformed into electrical energy

• Mechanical energy is transformed into electrical energy

• Mechanical energy is transformed into chemical energy.

• Electrical energy is transformed into mechanical energy.

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How is energy transferred when a car slows down to stop at a stop sign?

• Kinetic energy to chemical energy to thermal energy

• Chemical energy to kinetic energy to thermal energy

• Thermal energy to kinetic energy to chemical energy

• Kinetic energy to thermal energy to chemical energy

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You are riding your skateboard down a hill. As you go down the hill you speed up and the wheels get a little warmer.

What energy transformations are occurring as you are going down the hill?

• No energy transformations are involved.

• Potential energy is transformed only into Kinetic energy

• Potential energy is transformed into kinetic and thermal energy.

• Kinetic energy is transformed into potential and thermal energy.

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According to the Law of Conservation of Energy, in theory, a bouncy ball should never stop bouncing. However, we know that it does eventually stop. Why does the ball stop bouncing?

• Some energy gets converted in to light energy and is transferred to the surroundings.

• some energy gets converted into chemical energy and is transferred to the surroundings.

• some energy gets converted into mechanical energy and transferred to the surroundings

• Some energy gets converted into sound and thermal energy and is transferred to the surroundings.

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As a ball rolls down a ramp what happens to the energy?

• Both the potential and kinetic energy increase

• Potential energy increases and kinetic energy decreases

• Both potential and kinetic energy decrease

• Kinetic energy increases and potential energy decreases.

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You are riding your bike down the road and slam on the brakes. Your bike skids to a stop, what does the kinetic energy transform to?

• Potential Energy

• Thermal Energy

• Electrical Energy

• Chemical Energy

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What forms of energy are involved in an energy transformation while a book is falling?

• Kinetic energy only.

  As the book falls kinetic energy increases but potential energy does not change

• Potential and kinetic. As the book falls Potential energy decreses and kinetic energy increases

• Potential only. As the book falls potential energy decreases and kinetic energy does not change.

• Neither potential or kinetic energy is involved.

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Which items would have this energy transformation: chemical energy -> electrical, light and thermal energy?

• turning on a flashlight
• nuclear power plant
• digesting an apple
• tanning bed