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牛顿第二定律F=ma揭示了加速度和力与质量之间的关系.作用在一个物体上的力和加速度之间时刻对应:①力和加速度方向相同;②力发生变化,加速度同步发生变化.在解决牛顿第二定律的相关问题时,我们要紧扣“力”这一要素,以物体受力分析为主线,根据物体受力变化情况准确划分运动过程.1抓住“力”的变化,准确分析力的个数和大小,解决瞬时问题
Newton’s second law F=ma reveals the relationship between acceleration and force and mass. The force and acceleration acting on an object momentarily correspond to: 1 the force and acceleration are in the same direction; 2 the force changes and the acceleration changes synchronously. In solving the related problems of Newton’s second law, we must closely adhere to the “force” element, stress analysis of the object as the main line, accurately divide the movement process according to the change of force of the object. 1 grasp “force ”Changes, Accurately Analyze the Number and Size of Forces and Solve Instantaneous Problems