4th Energy

Where do most electric currents used to power cities come from?

• Solar panels

• Power stations

• Cars

• Windmills

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The main type of energy that powers TVs and lamps is–

• heat energy.

• electrical energy.

• mechanical energy.

• light energy.

For electric currents to occur, what must happen?

• Electric currents need to travel a very short distance.

• Electricity must have a switch.

• Electric currents need to come from batteries.

• Electricity must travel through a complete, unbroken circle.

You want to slow down a swing you are on. What do you need to do?

• Use less energy to make the swing slow down.

• Use more energy to make the swing slow down.

• Use sound energy to make the swing slow down.

• Use the same amount of energy you are using to make the swing slow down.

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What is produced the faster you rub your hands together?

• Stored energy

• Decreased sound energy

• Increased heat energy

• Decreased heat energy

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An object has more energy when it–

• moves fast.

• remains still.

• rolls.

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Which object has the most energy because of its speed?

• A ball rolling down the sidewalk

• A tree swaying in the wind

• A turtle swimming across a pond

• A car driving down the highway

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A child wants to ride her bicycle without having to pedal. Where could the child ride her bike to give it the most energy?

• Around a flat parking lot

• It is not possible to ride a bike without pedaling.

• Up a steep hill

• Down a steep hill

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When two cars collide, some energy is–

• created.

• turned into more mass

• transferred to the air, and sound is produced.

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A mother and her child are each rolling a ball to each other from across the room. If the balls collide, what about the balls is likely to change?

• Their mass

• Their shape

• Their direction

• Their state of matter

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