PS: Lesson 4.2:Friction

Friction is never useful

• True

• False

Too much friction can cause parts to wear out

• True

• False

Friction can cause scrapes on the skin

• True

• False

Some surfaces are so smooth that they have no friction

• True

• False

You use friction when you strike and light a match

• True

• False

It takes more force to slide than to roll a heavy object

• True

• False

Friction works in the same direction as the force applied to move an object

• True

• False

When a dolly is stationary, there is rolling friction between the wheels and ground

• True

• False

Static friction prevents you from sliding out of your chair to the floor.

• True

• False

The brakes on a bike create rolling friction

• True

• False