Impact Force from Falling Object

If an object of mass m=kg is dropped from height h = m, then the velocity just before impact is v = m/s. The kinetic energy just before impact is equal to its gravitational potential energy at the height from which it was dropped: K.E. = J. But this alone does not permit us to calculate the force of impact! If in addition, we know that the distance traveled after impact is d =m, then the impact force may be calculated using the work-energy principle to be Average impact force = F = N. 若一个质量为 m=kg 的物体从高度 h=m 处下落，则撞击前的速率为 v=m/s。撞击前的动能等于其从下落高度处的引力势能：K.E.=J。但仅凭此无法计算撞击力！如果此外还知道撞击后物体移动的距离为 d=m，则可利用功-能原理计算出平均撞击力：平均撞击力 = F=N。 中文译文中的待填/计算数值依次对应：1：m 2：h 3：v 4：ke 5：d 6：f。实际数值以上方原输入框为准。

Note that the above calculation of impact force is accurate only if the height h includes the stopping distance, since the process of penetration is further decreasing its gravitational potential energy.

The average impact force calculated here is the average over distance, which can be presumed to be proportional to, but not the same as, the average over time.