C. FrictionC. FrictionFriction

force that opposes motion between 2 surfaces

depends on the:• types of surfaces• force between the surfaces

C. FrictionC. FrictionFriction is greater...

between rough surfaces when there’s a greater

force between the surfaces (e.g. more weight)

Pros and Cons?

Types of FrictionTypes of FrictionStatic = occurs between 2

surfaces that touch but do not move in relation to each other

Sliding = occurs when one object slides over another. Weaker than staticCauses heat

Rolling = occurs between the surface of a round object and another surface.Weaker than slidingLess heat produced

Fluid friction = friction that opposes the motion of objects traveling though a liquid or gas.

Reducing frictionReducing frictionUse a lubricant

Change the type of friction involved

Make surfaces that touch smoother

Is friction always a problem? How could you increase friction?