Gravity and Friction

Force between two surfaces that are sliding is known as

• magnetism

• friction

• electric force

• I don't know

If you kick a soccer ball, it goes up to a certain distance and stops. This happens due to

• gravity

• magnetism

• friction

• weight

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On which surface would a ball move slowly?

• carpet

• marble floor

• wooden floor

• I don't know

Rough surfaces have

• more friction

• less friction

• same level of friction

• I don't know

Which of the following statements is not true?

• Friction is useful.

• Friction slows things down.

• Friction can stop things from moving.

• Friction is less on rougher surfaces.

What is gravity?

• A force
• Energy
• A push
• All of them

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Without gravity we would________. 

• Float away
• Stay in the ground
• Nothing would happen.
• I don't know

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Which objects have a STRONG force of gravity?

• Objects with GREATER mass, like elephants
• Objects with LESS mass, like mice

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Why a ball falls to the ground?

• Earth's force of gravity is GREATER than the ball's, so the ball gets attracted to the ground. 
• Earth's force of gravity is LESS than the ball's, so the ball gets attracted to the ground. 

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Which has more mass, Earth or the Moon?

• Earth
• Moon
• The same

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