Unit 3 Post Test

1. When an electric current flows through a wire:

• • gravitational field is created around the wire.

• • the wire becomes very cold.

• • the wire begins to spin.

• • a magnetic field is created around the wire

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1. When you climb to the top of a water slide, you are gaining:
   

• • gravitational kinetic energy.

• • Chemical energy.

• • gravitational potential energy.

• • chemical kinetic energy.

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NGSS.MS-PS3-2

3. Which of the following is true about the relationship between electricity and magnetism?

• Electricity can be used to create a magnet.

• Magnetism and electricity cannot be converted into one another.

• Magnetism is based on how gravity attracts electrical energy.

• Electrical energy and magnetism cancel each other out.

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When you walk across a rug on a cold dry winter day you might touch a doorknob and get a shock. What causes this shock?

• electrons moving from the rug to the wooden door

• electrons moving from the air to your hand

• electrons moving from your hand to the doorknob

• electrons moving from your hand to the rug

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Energy that is stored is called:

• potential energy.

• static energy.

• kinetic energy.

• physical energy.

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A waterfall is an example of

• energy being destroyed

• energy being created.

• kinetic energy being converted into potential energy

• potential energy being converted into kinetic energy.

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NGSS.MS-PS3-5

Two airplanes are flying in the sky in such a way that the gravitational attractions between them decreases. The planes must be flying:

• away from each other.

• next to each other at the same speed.

• towards each other.

• faster than the speed of sound.

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The force that keeps satellites in orbit around Earth is:

• Magnetic

• Friction

• Nuclear

• Gravity

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Why does it take more force to move a heavy box up a ramp than to move the same box down the ramp?

• There is more friction on the bottom of the box when going up a ramp.

• Gravity is pushing the box up the ramp at the same time you are pushing the box up the ramp.

• When you push an object up a ramp, you are working against atmospheric pressure, which is pushing down.

• When you push an object up a ramp, you are working against gravity, which is pushing down.

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A baseball is picked up from the floor and placed on the edge of a table top.

What type of energy does the baseball now have?

• chemical kinetic energy

• chemical potential energy

• gravitational kinetic energy

• gravitational potential energy

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NGSS.MS-PS3-2