Unit 6- Energy

Which of the following is an example of energy transformation from chemical energy to thermal energy?

• A wind turbine generating electricity

• A battery powering a flashlight

• A car engine burning gasoline

• A solar panel absorbing sunlight

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Describe the energy transformation that occurs when a toaster is used to toast bread.

• Electrical energy to mechanical energy

• Electrical energy to thermal energy

• Chemical energy to electrical energy

• Thermal energy to chemical energy

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Explain why a pendulum eventually stops swinging, even though energy cannot be destroyed.

• Energy is lost to the environment as sound energy

• Energy is transformed into potential energy

• Energy is transformed into kinetic energy

• Energy is transformed into thermal energy due to air resistance and friction

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Which of the following best describes the law of conservation of energy?

• Energy can be created and destroyed

• Energy can be transformed from one form to another, but the total amount remains constant

• Energy is always lost as heat

• Energy can only be stored, not used

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Identify the energy transformation that occurs when a plant uses sunlight to produce food through photosynthesis.

• Thermal energy to chemical energy

• Chemical energy to thermal energy

• Light energy to chemical energy

• Electrical energy to chemical energy

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A student claims that when a light bulb is turned on, electrical energy is transformed into light energy. What other form of energy is also produced?

• Sound energy

• Chemical energy

• Thermal energy

• Nuclear energy

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Which of the following scenarios best illustrates the transformation of mechanical energy into thermal energy?

• A book falling off a shelf

• Rubbing your hands together to warm them

• A car accelerating on a highway

• A plant growing in sunlight

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A battery-operated toy car moves across the floor. Describe the energy transformations that occur in this process.

• Chemical energy to electrical energy to mechanical energy

• Electrical energy to chemical energy to mechanical energy

• Mechanical energy to electrical energy to chemical energy

• Chemical energy to thermal energy to mechanical energy

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Explain how the energy transformations in a wind turbine illustrate the principle that energy cannot be created or destroyed.

• Wind's kinetic energy is transformed into mechanical energy, which is then converted into electrical energy, with some energy lost as sound

• Wind's potential energy is transformed into electrical energy, with no energy lost

• Electrical energy is transformed into wind's kinetic energy, which is then converted into mechanical energy

• Wind's kinetic energy is transformed into potential energy, which is then converted into electrical energy

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Which of the following is an example of energy transformation from electrical energy to sound energy?

• A television displaying a picture

• A radio playing music

• A refrigerator cooling food

• A lamp lighting a room

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