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静摩擦力发生在相对静止的物体之间,有时是阻力、有时是动力、有时存在、有时不存在,静摩擦力是否存在及其方向的分析对于学生来说有一定的难度,它是教学中的一个难点,下面我们提供两种分析方法,仅供同行们参考。 1 根据相对运动趋势分析静摩擦力是在紧密接触的物体和支承面间有相对运动趋势但没有发生相对运动时,它们之间产生的阻碍发生相对运动的力。方向:沿着接触面切线方向且与物体相对运动趋势方向相反。由此可见,问题的关键在于分析相对静止的物体间是否有相对运动趋势以及相
Static friction occurs between relatively static objects, sometimes resistance, sometimes power, sometimes present, and sometimes absent. The analysis of the existence and direction of static friction is difficult for students. It is one of teaching. Difficulties, we provide two kinds of analysis methods below, only for the reference of colleagues. 1 According to the analysis of the relative movement tendency, the static friction force is the force that hinders the relative movement between the closely contacting objects and the supporting surface when there is a relative movement but no relative movement occurs. Direction: The direction along the tangent line of the contact surface and the direction of the relative movement of the object. From this it can be seen that the key to the problem is to analyze whether there are relative movement trends and phases between relatively stationary objects.