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同一接触面上,滑动摩擦力与弹力满足f=μF_N,根据数学关系容易得到μ=f/F_N。如图1所示,假设摩擦力f与弹力F_N的合力为F_μ,令弹力F_N与合力F_μ之间的夹角为φ,则满足tanφ=f/F_N=μ。当改变该物体的受力条件后,弹力F_N与摩擦力f会同时发生变化,但两个力的比值保持不变,即弹力F_N与合力F_μ之间的夹角φ保持不变,那么合力F_μ的方向保持不变。这个合力
On the same contact surface, the sliding friction and elastic force satisfy f = μF_N, and μ = f / F_N is easily obtained according to the mathematical relation. As shown in FIG. 1, assuming that the resultant force of the frictional force f and the elastic force F_N is F_μ and the included angle between the elastic force F_N and the resultant force F_μ is φ, tanφ = f / F_N = μ is satisfied. When the stress condition of the object is changed, the elastic force F_N and the friction force f will change at the same time, but the ratio of the two forces remains the same, that is, the angle φ between the elastic force F_N and the resultant force F_μ remains unchanged. Then the resultant force F_μ The direction remains unchanged. This together