Friction and Gravity

What is gravity?

• A force that pulls objects toward the center of Earth

• A force that pushes objects away from Earth

• A type of energy

• A kind of friction

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What would happen to a ball if there were no gravity?

• It would float away

• It would fall faster

• It would bounce forever

• It would roll in circles

Which surface has the least friction?

• A carpeted floor

• A rough, bumpy sidewalk

• A smooth, icy road

• A gravel driveway

What is friction?

• A type of gravity

• A kind of electricity

• A force that slows down or stops objects

• A force that helps objects move faster

What happens when you slide a book across a table?

• Gravity will push it forward

• Friction will slow it down and stop it

• It will keep moving forever

• It will speed up

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Why do we not float away from Earth?

• Friction keeps us stuck to the ground

• The wind pushes us down

• The weight of the air holds us down

• Gravity pulls us toward Earth

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If you rub your hands together quickly, they feel warm. Why?

• Friction creates heat when things rub together

• Gravity pulls heat into your hands

• The air around your hands is hot

• The movement creates cold air

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Which of these objects would fall the fastest without air resistance?

• A book

• A balloon

• A feather

• They would all fall at the same speed

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What would happen if there were no friction?

• Objects would keep moving without stopping

• People would slide instead of walking

• Cars could not stop

• All of the above

Why do astronauts float in space?

• Their space suits make them lighter

• There is less air in space

• There is no gravity in space

• They are too far from Earth’s gravity to feel its pull