Force and Motion

Which material is friction to cause the greatest resistance to motion?

• aluminum foil

• sandpaper

• wax paper

• plastic wrap

What causes a change in motion?

• force

• position

• potential energy

• kinetic energy

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Is this an example of-

• potential energy

• kinetic energy

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A student applies the brakes on his bike. This squeezes the brake pads against the wheels and the bike slows down. What causes the bike's speed to decrease?

• static

• friction

• potential energy

• electric current

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A boy rubs wax on his snowboard, so it will go down the mountain faster. Which science fact is he proving?

• Smooth, slippery items have more friction.

• Water freezes if the temperature is below 32° F.

• Snow melts when the temperature is above 32° F.

• Smooth, slippery items have less friction.

What changes the movement of an object by slowing it down?

• motion

• friction

• direction

• inertia

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Which wagon will take the most force to get up a hill?

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Which example best shows friction?

• The walking club slows down at the end of their walk to stretch.

• For the first few seconds, the parachuter gains speed after jumping out of a plane.

• The brakes on the car heated up as they were pushed and the car slowed down.

• A snow drift starts to fall down a mountain picking up more snow along the way.

• Toddlers pedal fast in a tricycle race to see who will be the winner.

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Force that pulls objects back towards Earth

• Friction

• Direction

• Speed

• Gravity

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What two words describe an object in motion?

• direction

• mass

• speed

• volume

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