Forces and Friction Review

A force that opposes motion between surfaces that are touching.

• force

• friction

• net force

A push or a pull acting on an object.

• force

• friction

• net force

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NGSS.MS-PS2-2

Combination of all of the individual forces acting on an object.

• force

• friction

• net force

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The SI unit for force is

• kilograms (kg)

• Newtons (N)

• pounds (lb)

Force can cause an object to change

• speed

• direction

• both speed and direction

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NGSS.MS-PS2-1

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Because it has both size and direction, force is a

• scalar

• vector

What is the net force on the soccer ball?

• 200 N

• 125 N

• 50 N

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

In which direction will the soccer ball move?

• left

• right

• the ball will not move

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which situation causes the most friction?

• smooth surface, heavy object

• smooth surface, light object

• rough surface, heavy object

• rough surface, light object

Which type of friction is shown in the picture?

• fluid

• rolling

• sliding

• static