1. µ must be kidding!

2. * The Force of Friction depends on: * The surfaces in contact * The amount of the normal force * Whether the object is moving (kinetic) or stationary (static) * Ff = µFn

3. * µ = coefficient of friction which is a “unitless” number which depends on the surfaces in contact. * µ s = static coefficient of friction which is used when the objects are static (not moving relative to eachother. * µ k = kinetic coefficient of friction which is used when the objects are sliding relative to eachother.

4. * µ s > µ k Surfacesµ staticµ kinetic Wood on wood0.40.2 Rubber on concrete1.00.8 Banana peel on bugs bunny0.10.0000006

6. * Ff = µ k F n * When objects are sliding this is always an equality * The kinetic coefficient of friction is less than the static coefficient of friction