Unit 3: Energy Review

Which of these are evidence that energy moves from place to place? Choose all correct answers.

• A lamp is plugged in with the switch turned off.

• A flashlight lights a path outside on a dark night.

• A metal spoon in a bowl of hot soup gets warmer.

• A person hears an alarm clock buzz across the room.

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Suppose you are riding a bike. When will the bike have the most motion energy?

• When you are coasting down a hill

• When you are braking and slowing down

• When you are pedaling fast on a flat path

• When you are pedaling fast going down a hill

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Which of these are renewable energy resources? Choose all correct answers.

• Oil

• Wind

• Sunlight

• Coal

• Water

Which sentences describe motion energy changing to another form of energy? Choose all correct answers.

• When you hit a drum with a drumstick, you hear a noise.

• When you clap your hands fast, your hands get warmer.

• When a soccer player kicks a moving ball, the ball moves faster.

• A ball that is sitting still starts moving when another ball rolls into it.

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Which part of the circuit supplies energy?

• The wires

• The switch

• The battery

• The lightbulb

What will happen when the switch is closed? Why will it happen?

• The lightbulb will turn off because the circuit is broken.

• The lightbulb will turn on because the circuit is complete.

• Nothing will happen because the battery is missing.

• The lightbulb will explode because too much energy is supplied.

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What form of energy do all the devices use?

• Solar energy

• Electrical energy

• Wind energy

• Chemical energy

How does the energy get to the devices?

• Through batteries

• Through solar panels

• Through power lines

• Through wind turbines

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The main energy changes that take place in each device are:

• Lamp: Electrical to light, Hair dryer: Electrical to sound, Kettle: Electrical to light

• Lamp: Electrical to heat, Hair dryer: Electrical to light, Kettle: Electrical to sound

• Lamp: Electrical to light, Hair dryer: Electrical to heat, Kettle: Electrical to heat

• Lamp: Electrical to sound, Hair dryer: Electrical to heat, Kettle: Electrical to light

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Which answer choice best describes the energy changes that allow the phone to work?

• The charger changes electrical energy to motion energy. The phone changes motion energy to light and sound.

• The charger changes motion energy to electrical energy. The phone changes electrical energy to light and sound.

• The charger changes motion energy to electrical energy. The phone changes electrical energy back to motion energy.