WHAT IS IT?
The force that slows motion
between two surfaces that are
in contact with each other.
REAL LIFE EXAMPLES
 A baseball player diving into home
plate.
 Tires on a car can roll freely
 Tennis shoes on the stairs versus
slippers
PROS AND CONS
Pros
1.
2.
3.
4.
Cons
 1.
 2.
 3.
 4.
SLIDING FRICTION
When two solid surfaces slide
against each other.
ROLLING FRICTION
When a circular object rolls freely
over a surface.
STATIC FRICTION
A force that stops the movement of
two objects that are against each
other and at rest.