Next: Problem Solving Strategy
fsN where is the coefficient of static
N is the magnitude of the normal force. Equality holds when
the object is on the point of slipping:
fs(max) = N .
fk = N where is the coefficient of kinetic
is approximately constant for any given pair of materials.
- Values of and depend on the nature of the surfaces that
are in contact. Usually
< . Examples: rubber on concrete
= 1.0, = 0.8 ; waxed wood on wet snow
= 0.14, = 0.10.
- The direction of the force of friction is opposite to the direction the
object wants to move.
- and are nearly independent of the area of contact between
the two surfaces.
- is nearly independent of the velocity of the object under