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物体在粗糙的接触面上滑动时,受到来自接触面的约束作用.物体受到的弹力N和滑动摩擦力f的合力叫全反力,记为R.全反力是被动力,其大小跟弹力和摩擦力的大小有关,但该力的方向是确定的,该力和接触面法线之间的夹角的正切值总是等于物体和接触面间的动摩擦因数μ.证明如下,设全反力和接触面法线之间的夹角为φ(该角又叫摩擦角),
When the object slides on the rough contact surface, it is restrained by the contact surface.The resultant force of the object N and the sliding friction force f is called the total reaction force, which is denoted as R. The full reaction force is the force, whose size and elasticity And the size of the friction force, but the direction of the force is determined, the force and the normal contact surface of the tangent is always equal to the dynamic friction coefficient between the object and the contact surface μ. Prove the following, The angle between the force and the normal of the contact surface is φ (this angle is also called the friction angle)