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如果一个物体受到两个或两个以上的力的作用而处于平衡状态（包括静止状态或匀速直线运动状态），那么，这个物体在某一方向上所受的各力的数值之和必等于相反方向上所受的各力的数值之和．利用此规律可以方便的解有关摩擦力的问题．下面举例说明：一、判断摩擦力的有无例1如图
If an object is subjected to two or more forces and is in equilibrium (including a stationary state or a uniform linear motion state), then the sum of the values of forces exerted by the object in one direction must equal the opposite direction. The sum of the values of each force received. Use this law to easily solve the problem of friction. The following examples illustrate: First, determine whether the friction of the 1 example