| Frictional Force |
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Frictional force in Mechanics is the Force which opposes the relative motion of an object. It is directed opposite to the motion of an object. There are three types of frictional forces. # Static Friction is the friction acting on a body when the body is not in motion, but when a force is acting on it. Static friction is the same as the force being applied (because the body isn't moving). Static friction acts because the body tends to move when a force is applied on it. # Limiting Friction is the friction on a body just before it starts moving. Generally, limiting friction is highest. # Kinetic Friction is the friction which acts on the body when the body is moving. Kinetic friction is usually smaller than limiting friction. The kinetic frictional force of a solid-solid interface is given by: : where N is the normal force acting between the interface and the object and is the Coefficient Of Kinetic Friction . The value of the coefficient depends upon the nature of the surfaces. The limiting friction is given by : where N is the normal force acting between the interface and the object and is the Coefficient Of Limiting Friction . For a Fluid , the frictional force is directly proportional to the velocity of the object. See also Drag |
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