To analyse the motion of a rigid body sliding along a rough surface, information on the point of application of the resulting frictional and normal forces is usually not required. The present study proceeds further, by finding the direction and point of application of the resulting frictional and normal forces on a rigid body in planar motion. These findings are usually omitted in traditional analyses of these problems. It will be shown that such a sliding motion, which is assumed to be feasible with the finding of the acceleration, is not possible for certain combinations of coefficient of friction and geometry of the rigid body. Some interesting findings are highlighted and discussed.
