绘制力的示意图

绘制并解读力的示意图，用带标注的箭头表示力——箭头的长度表示力的大小，箭头的方向表示力的作用方向；在同一物体上标出多个力；根据示意图判断这些力是平衡的还是不平衡的：平衡力是大小相等、方向相反的箭头，没有合力；不平衡力是箭头大小不同，会产生合力；用单个箭头表示合力。

Draw and interpret force diagrams showing forces as labelled arrows — where the arrow's length represents the force's magnitude and its direction shows which way the force acts; show multiple forces on one object; identify from the diagram whether forces are balanced (equal arrows in opposite directions, no resultant) or unbalanced (arrows of different sizes, producing a resultant); represent the resultant with a single arrow

学习证据 / Evidence

• 画出一张力的示意图，用带标注的箭头表示至少两个作用在物体上的力的方向和相对大小。
• 利用示意图解释这些力是平衡的还是不平衡的，以及物体接下来会发生什么。
• 在示意图中添加一个合力箭头，并解释是如何得出这个合力的。

• Draw a force diagram with labelled arrows showing direction and relative size for at least two forces acting on an object
• Use their diagram to explain whether forces are balanced or unbalanced and what will happen to the object
• Add a resultant force arrow to a diagram and explain how they calculated it

评估问题 / Assessment

如果让{{name}}画一张示意图，表示放在桌子上静止的书所受到的所有力，他们能否画出两个箭头——一个向下表示重力，一个向上表示桌子对书的力——并解释如果这两个力平衡，为什么书不会移动？

If {{name}} is asked to draw a diagram of all the forces acting on a stationary book on a table, can they draw two arrows — one pointing down for gravity and one pointing up from the table — and explain why, if they're balanced, the book doesn't move?