Unit 2 Using Energy Test

Dolphins communicate using special vibrations and sounds. How is this possible?

• Dolphins have very good hearing.

• Light energy can flow easily through water.

• Dolphins make loud sounds only other dolphins can hear.

• The energy is transferred from one dolphin to another through sound.

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Adam and Terry are building an electromagnet, like the one shown in the diagram. They want to test how the battery's stored energy affects the strength of the electromagnet. Which result would the students expect to see in their investigation?

• The battery with the higher stored energy will produce more electric current and will strengthen the electromagnet.

• The battery with the lower stored energy will produce more electric current and will weaken the electromagnet.

• The battery with the higher stored energy will produce less electric current and will weaken the electromagnet.

• The battery with the lower stored energy will produce more electric current and will strengthen the electromagnet.

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Light travels in a ______________ path.

• curved

• straight

• random

Why are sounds not heard in space?

• Space is too cold for sound waves to travel.

• There is too much matter to travel through in space.

• Space is a vacuum with few particles to travel through.

• Energy cannot travel in space.

How does sound energy travel?

• in strings

• in beams

• in pulses

• in waves

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Sound waves CANNOT travel through ______________________.

• empty space

• mediums

• longitudinal waves

• transverse waves

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A pom-pom launcher ______.

• transfers kinetic energy to thermal energy

• transforms kinetic energy to sound energy

• transforms potential energy into kinetic energy.

• transfers energy of motion to stored energy

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When a student plays a guitar, how does the sound travel to reach your ears?

• using echos

• through potential energy

• through thermal energy

• through sound waves

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___________________ is an excellent thermal conductor because it conducts heat easily.

• aluminum

• wood

• plastic

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How does heat travel from the Sun to Earth?

• conduction

• convection

• radiation

• conduction & convection

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