Friction as a Force

Which of the following is NOT an example of friction?

• using the brakes on your bike to slow you down

• putting your hand out the window

• a satellite traveling through deep space

• a hockey puck going across an ice rink

A puck slides along an icy surface. What makes it slow down?

• It runs out of push

• It rubs against the ice

• It runs out of electricity

Tags

NGSS.MS-PS2-2

On which surface will a toy car travel the furthest?

• Carpet

• Polished Wood

• Ice

Rougher surfaces have ...

• greater friction

• less friction

• the same level of friction

Which of the following statements is false?

• Friction can only slow things down

• Friction is never useful

• Friction can stop things from moving

Ways to reduce frictional force

• use lubricants

• use grease

• use magnesium carbonate chalk powder

• use rollers and ball bearings

Properties of friction

• it is a contract force

• it oppose motion of an object

• it moves on smooth surface

The substances that are used to smooth the surface to reduce friction is called ____________ .

Sometimes there is a need to reduce friction

• true

• false

the friction force is a contact force

• true

• false