一、静止在水平面上的物体受到重力和支持力的作用．重力与支持力是怎样的关系呢？“重力与支持力大小相等”．这样的回答是以偏概全的，是不正确的．正确答案应是“二力平衡”，即满足了二力平衡的四个条件，而上述回答仅是四个条件中的一个．二、静止在水平面上的物体，水平 1. Objects that are resting on a horizontal surface are affected by gravity and supporting forces. What is the relationship between gravity and support? “Gravity and support are equal”. This answer is partial and inaccurate. The correct answer should be “two forces balance”, that is, to satisfy the four conditions of the two forces balance, and the above answer is only one of the four conditions. Second, the level of static objects, horizontal