Energy Transfer and Conservation Unit Test

Sam burns some wood in his fireplace. When the wood burns, the chemical energy stored in the wood is changed into _______ energy.

• nuclear

• electrical

• thermal

• mechanical

Eddie lifts a heavy book onto a table in the library. The energy that is stored in the book as it sits on the table is an example of

• kinetic energy

• potential energy

• conservation of energy

• solar energy

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NGSS.MS-PS3-2

The sun's energy used by green plants to produce food is an example of light energy converted to which other form of energy?

• kinetic energy

• heat energy

• mechanical energy

• chemical energy

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The total potential and kinetic energy of the particles of an object is the object's _________

• nuclear energy

• electromagnetic energy

• mechanical energy

• thermal energy

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NGSS.MS-PS3-4

A stretched rubber band is released. What is the energy transformation?

• kinetic to potential energy

• chemical to thermal energy

• kinetic to thermal energy

• potential to kinetic energy

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NGSS.MS-PS3-5

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Which of the following is true about ALL energy transformations?

• Energy is never lost; it just changes from one from to another.

• Energy never changes forms, only the amount of energy changes.

• The end product of all energy transformations is electrical energy.

• The end product of all energy transformations is chemical energy.

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NGSS.MS-PS3-5

When you move your arm, your body changes chemical energy supplied by food into _______ energy.

• light

• electrical

• potential

• mechanical

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NGSS.MS-PS3-5

Engineers are building a dam in a river valley. Once the dam is built, a reservoir will develop. If the engineers released the water at the base of the dam, which energy transformation are they attempting to achieve?

• converting electrical to potential energy

• converting potential to electrical energy

• converting electromagnetic energy to kinetic energy

• converting kinetic to gravitational energy

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NGSS.MS-PS3-5

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Which type of energy transfer occurs in an electric motor?

• Chemical energy changes into mechanical energy

• Mechanical energy changes into electrical energy.

• Light energy changes into electrical energy.

• Electrical energy changes into mechanical energy.

What role does a generator play in an electrical circuit?

• The circuit sends energy through the generator.

• The generator changes electricity into motion.

• The generator changes mechanical energy into electrical energy.

• The generator changes the direction that energy glows in a circuit.