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[实验目的]验证力的合成的平行四边形定则.[实验原理]此实验是要用互成角度的两个力与一个力产生相同的效果(即:使橡皮条在某一方向伸长一定的长度),看其用平行四边形定则求出的合力与这一个力是否在实验误差允许范围内相等.如果在实验误差允许范围内相等,就验证了力的平行四边形定则.[实验器材]方木板一块,弹簧秤两个,白纸,橡皮条一段,细绳套两个,图钉(若干),三角板,刻度只,铅笔.
[Experimental purpose] verification of the resultant parallelogram rule of force. [Experimental principle] This experiment is to use the two forces at mutual angles to produce the same effect as one force (ie, to make the rubber band stretch in a certain direction.) The length of the specimen is to see if the resultant force obtained by the parallelogram rule is equal to the allowable experimental error. If the experimental error is within the allowable range, the parallelogram rule of the force is verified. [Experimental equipment ] A wooden board, two spring balances, white paper, a piece of rubber, two sets of thin rope, push pin (a number), set square, scale only, pencil.