Contact Force

Friction

the force that opposes

the motion between two surfaces

in contact.

Air resistance

a special

type of frictional force that acts

upon objects as they travel through

the air.

tension

the force

transmitted through a string,

rope, or cable when it is

pulled tight by forces acting

from opposite ends.

Normal Force

the force

exerted perpendicular to

the surface when one

object pushes against

another.

Applied Force

is a force that is

applied to an object by a person

or another object.