Force, Gravity, Friction, Work

What is gravity?

• Gas

• A force

• A mass

• The atmosphere

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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 a STRONGER force of gravity, Earth or the Moon?

• Earth

• Moon

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Which of these best describes friction?

• A rubbing force.

• Something that is slippery.

• Gravity.

• Movement across a smooth surface.

How does friction affect speed?

• more friction decreases speed

• more friction increases speed

• less friction decreases speed

Friction is a force that acts in an ___________ direction of movement.

• similar

• opposite

• parallel

• west

Rougher surfaces have ...

• greater friction

• less friction

• the same level of friction

Which force must have the objects touching in order for it to work?

• gravity

• friction

• magnestism

• all of them

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NGSS.MS-PS2-5

What would happen if there was no gravity?

• Everything would float

• Everything would be the same

• Nothing would change

• Everything would sink

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Force is a push or pull

• true

• false

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