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一运用牛顿运动定律解决超重与失重问题要让学生明确超重与失重的实质,不是重力的变化而是视重的变化。它的决定因素不在于物体向上还是向下运动而是取决于加速度的方向是向上还是向下。超重或失重的多少由m和a共同决定,大小为ma。判断超重和失重现象的三个技巧:1.从受力的角度判断当物体受向上的拉力(或支持力)大于重力时,物体处于超重状态;小于重力时处于失重状态;等于零时处于完全
A use of Newton’s law of motion to solve the problem of overweight and weightlessness Make students clear the essence of overweight and weightlessness, not gravity but the change of importance. The decisive factor is not whether the object moves up or down but rather whether the direction of the acceleration is up or down. The amount of overweight or weightlessness is determined by m and a, the size is ma. Three techniques for judging overweight and weightlessness: 1. Judging from the force point of view, when an object is subjected to an upward tensile force (or supporting force) greater than gravity, the object is in an overweight state; it is in a state of weightlessness less than gravity;