Friction |
value fs . Thus tan fs = ms The angle fs is called the angle of static friction. Angle of kinetic friction: When slippage is occuring, the angle a has a value fR corresponding to the kinetic friction force. tan fR = mR Cone of friction: When a body is having impending motion in the direction of P the frictional force will be the limiting friction and the resultant reaction R will make limiting friction angle a with the normal as shown in the following figure. If the body is having impending motion in some other direction, again the resultant reaction makes limiting frictional angle a with the normal in that direction. Thus, when the direction of force P is gradually changed 3600 , the resultant R generates a right circular cone with semicentral angle equal to a.
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