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Friction Friction results from relative
motion between objects. Frictional forces are forces that
resist or oppose motion.
Coefficient of friction ()
—Feet on rocks = large
—Polar bear on ice = small
Friction(A Fun Formula)
Ff = Fnfun
get it?
Friction(A Fun Formula)
Ff = Fn
Normal force (N)
Coefficient of frictionNo units!
Friction force (N)
Friction
Ff = Fn=FfFnFn =
Ff /
To solve for frictional force
To solve for normal force
To solve for coefficient of friction
Calculate force of friction
A box weighs 100 N (Fn).
As the box is pushed horizontally, the coefficient of sliding friction is 0.25.
Determine the force of friction resisting the motion.
To solve for frictional force:
Ff = Fn
Fn = 100 N Ff = (0.25)(100 N) Ff = 25 N
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