Energy Transformation SSA Review WKST

15. Emma constructed a simple motor. When connected correctly, the coil of copper wire spins. Which of the following best describes the energy transformation that takes place between the paper clips and the spinning coil?

• Chemical energy transforms into electrical energy

• Mechanical energy transforms into electrical energy.

• Electrical energy transforms into mechanical energy

• Mechanical energy transforms into chemical energy.

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16. A television is a device that converts electrical energy into light and sound energy. Not all the energy that enters a television is converted into light and sound, however. What happens to the energy that enters a television but is not converted into light or sound?

• The energy returns to the electrical socket.

• The energy is stored in the wires in the television

• The energy is lost as heat

• The energy is destroyed in the conversion process

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17. Ms. Simpson's science students were observing a demonstration with Newton's cradle, as shown in the

diagram below. They noticed that when the ball was raised and released on the left side, it hit the stationary balls, and its kinetic energy was transferred all the way to the last ball on the right, causing it to be propelled up. This action continued for a while, but as time went on, the balls did not go as high and eventually stopped.

Why did the balls stop moving?

• The combined mass of the balls could not be overcome by the force of one moving ball.

• Due to the force of gravity pulling the balls down, energy was

  continually lost to the surrounding environment.

• Due to air resistance and friction between the string and the

  frame, some of the energy was transferred to the surroundings.

• The three middle balls blocked the energy from getting to the

  outside balls, so they could not rise as much.

18. A group of students are eating in

the cafeteria. As they eat, the students break down the molecules in the food, which releases energy. Which form of energy is stored in the food?

• chemical energy

• elastic energy

• nuclear energy

• thermal energy

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19. Mary throws a tennis ball into the air. It rises, stops

momentarily when it reaches its greatest height, and then falls back to the ground. At what point does kinetic energy converted to potential energy?

• When the tennis ball is rising.

• When the tennis ball is falling.

• Just after the tennis ball hits the ground.

• While the tennis ball is at the highest point.

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20. There is a good deal of stored energy in gasoline, which makes it useful as fuel for cars. When gasoline is burned in a car engine, what happens to this energy?

• It is destroyed as it is used to make the engine in the car run.

• Some of it is transformed into kinetic energy and some into

  potential energy.

• Some of it makes the car run, but most of it disappears before being transformed.

• It is transformed into kinetic energy, sound energy, and heat energy.

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21. Which of the following is the best example of chemical energy being transformed into light energy and heat energy?

• boiling water on an electric stove

• turning on a battery powered flashlight

• watching a movie on television

• using a solar panel to charge batteries

22. Thomas goes into his room to do his homework. He turns on his desk lamp, which uses a 60-watt (60 W) light bulb. After an hour he finishes his homework and reaches to turn off the lamp. When he touches the top of the lamp, he notices that it feels warm. Why does the top of the lamp feel warm?

• Some of the electrical energy was changed to heat.

• Some of the electrical energy was destroyed.

• The light bulb used more watts than it needed to.

• The light bulb was faulty and did not work correctly.

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