影响力的作用效果有力的大小、方向和作用点，这三个因素叫做力的三要素．力的三要素不同时，力的作用使物体产生形状改变或运动状态改变效果一般是不同的．力的三要素可以用力的图示来表示，也就是用一根带箭头的线段来表示力．但是初学者在画力的图示时往往出现这样或那样的 The effect of force on the size, direction, and point of action of a force. These three factors are called the three elements of force. When the three elements of force are not the same, the effect of force causes the object to produce shape change or the effect of change of motion state is generally different. The three elements of force can be represented by a powerful icon, that is, a line segment with an arrow to indicate force. But beginners tend to show this or that