Chapter 7 Review Questions Energy

When gasoline is burned in a car engine, ________ energy is converted into _________ energy.

• heat, chemical

• chemical, potential

• mechanical, chemical

• chemical, mechanical

Which example involves the transformation of chemical energy directly into light energy?

• a windmill

• a glow stick

• photosynthesis

• a hydroelectric dam

Electrical energy can be transformed into other types of energy. We often experience these changes of energy in our everyday lives. Which example is a transformation from electrical energy to light energy?

• motor

• flashlight

• slow cooker

• solar panels

Jane puts some water into an electric kettle and then she connects it to the power source. She observes that after some time, the water inside the kettle heats up and begins 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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The rock in the picture is pushed over the edge and it begins to fall. Which type of energy conversion is taking place?

• mechanical to heat

• sound to mechanical

• potential to kinetic

• kinetic to potential

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Energy can be changed from one form to another. Changes in the form of energy are called energy conversions. Identify which best describes the energy used to pluck guitar strings to make sound.

• electricity

• electromagnetic

• heat

• mechanical

A light bulb converts electrical energy into light and ____.

• chemical.

• electromagnetic.

• heat.

• nuclear.

How can we increase the gravitational potential energy of the car?

• Keep the length of the hill at 50 m but only 5 m tall.

• Keep the hill at 10 m tall but increase the length of the hill so that the car has farther to roll.

• Take the interior out of the car so that the car has less mass.

• Strap a boulder to the car so that it weighs more.

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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 decreases.

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

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

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

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The process by which people walk

• requires only a little energy.

• is powered by the body’s surplus heat energy.

• relies on the conversion of chemical energy from food into mechanical energy by muscles.

• relies on the creation of mechanical energy by muscles, which is transferred into heat energy.

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