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1问题的提出 牛顿第二定律的教学,我们总是先用实验得到物体受一个力作用时,加速度的大小跟作用力成正比,跟物体的质量成反比;加速度的方向跟作用力的方向相同的结论,然后利用合力概念,把上述结论推广到物体受多个力作用的情况.但我在2002届的教学中却遇到了意外的情况.一个学生提出,以前学习的合力概念及力合成的平行四边形定则是从力使物体产生形变的效果中得到的,对于力使物体产生加速度的作用效果,合
1 Newton’s second law is taught in the question, we always use the experiment to get the object to be affected by a force. The magnitude of the acceleration is proportional to the force and inversely proportional to the mass of the object; the direction of the acceleration is the same as the direction of the force. The conclusion was then used to apply the concept of synergy to generalize the above conclusions to situations in which the object was affected by multiple forces. However, I encountered an unexpected situation in the teaching of the 2002 session. One student proposed that the concept of synergy and the ability to synthesize The parallelogram rule is derived from the effect of force on the deformation of an object, and the effect of force on the acceleration of the object.