Friction is the resistance to motion which is experienced whenever a solid body slides over another. The resistive force which is parallell tothe direction of motion is called the "friction force". If the solid bodies are pressed toward each other and a force is applied, then the value of the force which is required to initiate sliding is the "static friction force". The force required to maintain sliding is the "kinetic (or dynamic) friction force". Kinetic friction is generally lower than static friction.

A friction joint will be locked until the tangential force is bigger than the static friction. All surfaces are rough looked on in a microscopic scale and true contact is obtained over a small fraction of the apparent contact area. Furthermore the real area of contact is independent of the apparent area of contact.


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