Protracting object's free-body diagram is a course of analysising object's force from other object.
画受力图是解决力学问题关键的一步。
Protracting object's free-body diagram is a course of analysising object's force from other object in fact.
绘制物体受力图的过程就是对物体进行受力分析的过程，学会画受力图是解决力学问题关键的一步。
View a Free Body Diagram of all the forces (including gravitational and normal forces).
看所有力的自由体受力图(包括重力和正向力)。
View a Free Body Diagram of all the forces (including gravitational and normal forces).
看所有力的自由体受力图(包括重力和正向力)。
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