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[实验目的]验证互成角度的两个力合成时遵循平行四边形法则.[实验原理]由共点力的平衡条件知,当三个共点力平衡时,任意二力的合力一定是第三个力的平衡力.根据此原理,如使F_1和F_2的合力作用效果与F′的作用效果相同(都使橡皮条伸长到同一位置),则F_1和F_2的合力与F′等大同向.实验时,由平行四边形法则作出F_1和F_2的合力F的图示,再作出F′的图示,比较F、F′是否大小相等、方向相同.
[Experimental purpose] Verify that the two forces combined at an angle to each other follow the parallelogram rule. [Experimental principle] knows from the equilibrium condition of the common point force that when three common point forces are balanced, the resultant force of any two forces must be the third The balance force of the force. According to this principle, if the resultant force effect of F_1 and F_2 is the same as the effect of F′ (both make the rubber band stretch to the same position), then the resultant force of F_1 and F_2 is in the same direction as F′ and so on. During the experiment, the figure of the resultant force F of F_1 and F_2 was made by the parallelogram rule, and the figure of F′ was again shown, comparing whether F and F′ are equal in size and direction.