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摩擦角是力学中的一个重要概念,在工程力学中有广泛应用。如果作用于物块的全部主动力的合力的作用线在摩擦角之内,则无论这个力怎样大,物块都将保持静止。称这种现象为自锁现象。由于摩擦力与支持面的支持力是成对出现的,引入摩擦角后,可以将这对力合成一个力,在物体的平衡态受力分析中能很大程度上起到问题简化的效果。尤其是当物体在四个力作用下保持动态平衡的问题中,引入摩擦角后就可以简化成我们熟悉的三力平衡问题。
Friction angle is an important concept in mechanics and is widely used in engineering mechanics. If the line of action of the resultant of all the main forces acting on the mass is within the friction angle, the mass will remain stationary no matter how large this force is. Call this phenomenon a self-locking phenomenon. Because the friction force and the supporting force of the support surface are paired, the friction angle can be introduced into a force, which can greatly simplify the problem in the equilibrium state force analysis of the object. Especially when the object maintains the dynamic equilibrium under the action of four forces, the introduction of the friction angle can be simplified into the familiar three-force balance problem.