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Frictional Force

Frictional Force. µ must be kidding!. 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 = µ Fn. Frictional Force.

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Frictional Force

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  1. Frictional Force 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 Frictional Force

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

  4. µs > µk Coefficient of Friction

  5. Fs µsFn • The static frictional Force is typically only as big as it needs to be. • The static frictional force is a maximum when the above equation is an equality (like when an object on an inclined plane just starts slide as the angle of incline is increased) Static Frictional Force

  6. Ff = µk F n • When objects are sliding this is always an equality • The kinetic coefficient of friction is less than the static coefficient of friction Kinetic Frictional Force

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