Science 4 Unit 2 Review

Alonzo has a battery-operated toy car. When he turns it on it moves across the floor. Which energy transformation happens in the toy car?

• A. sound energy to stored energy to electrical energy

• B. electrical energy to stored energy to motion energy

• C. motion energy to electrical energy to sound energy

• D. stored energy to electrical energy to motion energy

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The girl is using an electrical appliance that has a motor. Which energy transformation is she using?

• A. electrical energy into sound and chemical energy

• B. electrical energy into heat and motion energy

• C. sound into electrical and motion energy

• D. motion energy into electrical and sound energy

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What would happen to the light bulb if Roberto changed the switch from closed to open?

• A. It would be duller.

• B. It would be brighter.

• C. It would stop glowing.

• D. It would start glowing.

Which device converts electrical energy to light?

• A. lamp

• B. radio

• C. battery

• D. solar panel

Which kind of energy transformation occurs in a generator, where energy is collected?

• A. heat into electrical energy

• B. electrical energy into energy of motion

• C. energy of motion into electrical energy

• D. electrical energy into heat and energy of motion

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NGSS.MS-PS3-5

An ice cube is placed in a glass of warm tea. Later, the ice has melted, and the tea is cooler. How was energy transferred as the ice melted? (Hint: Remember the Hot to Cold song.)

• Heat was transferred from the ice cube to the warm tea.

• Light energy from the warm tea was transferred to the ice cubes.

• Heat from the warm tea was transferred to the ice cubes and the glass.

• Electrical energy was transferred from the tea to the surrounding air and glass.

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What kind of energy transfer happens with a solar panel?

• Heat is transferred to the panel when it is connected to an electrical source.

• Electrical energy is transferred to the panel when it is connected with an electrical source

• Energy is transferred to the panel when light waves from the sun are absorbed by the panel.

• Mechanical energy is transferred to the panel when waves from the sun push against the panel and move it.

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One example of heat transfer by touch is:

• the sun heating a pond

• snow melting on a hot day

• a person keeping warm by a fire

• warming hands on a cup of hot chocolate

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Sound waves travel most slowly through:

• air

• iron

• wood

• water

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Vibrations that travel through air create:

• sound energy

• potential elergy

• electrical energy

• chemical energy

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