Friction and Air Resistance

Air resistance is a type of friction.

• True

• False

If pushing a sled over grass or ice, which has more friction?

• Grass

• Ice

Friction is ___________

• Only when 2 things rub together

• An example of gravity

• When the planets revolve around the sun.

• A force that opposes motions of an object.

Basketball players choose their shoes carefully because they want to ____________ friction on the basketball court.

• Increase

• Decrease

If you are moving heavy furniture and want to reduce friction, what could you do?

• Get strong to make it easier to pick up.

• Put a blanket under it and slide it.

• Add water to the floor.

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In which situation is it better to have low friction?

• A football player wearing cleats.

• A student walks down a hallway.

• A ladder leans against a wall.

• A hockey puck slides towards the goal.

A builder uses sandpaper on a piece of wood to make it smooth. Did he increase or decrease the friction?

• Decreased it

• Increased it

Why does a feather fall through the air more slowly than a bowling ball?

• Feathers come from birds so they can fly.

• Air resistance

• I don't know.

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Which combination would reduce friction the most?

• Ice on a paved road.

• Sand on a paved road.

• Water on a dirt road.

• Gravel on a dirt road.

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Planes are built to have a pointed end in order to fly more easily through the air. What are they trying to combat when flying?

• Gravity

• Birds

• Air Resistance

• Clouds

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