自由落体时如何测量iphone所覆盖的距离？ [英] How to measure the distance covered by iphone during free fall?

问题描述

在自由落体期间，iphone应该在所有三个轴上发送加速度值为0。那么如何检测iphone所覆盖的距离？

During the free fall the iphone is supposed to send acceleration values as 0 on all the three axis. So how to detect the distance covered by the iphone?

推荐答案

不要相信牛顿定律，他们会忽略空气阻力，Iphone旋转等用经验方法代替。让设备从1米，2米，5米，10米，30米等高度落下......每个高度重复几次。在每个秋季测量时间。样条曲线的近似结果。计算反函数。

Do not trust Newton laws, they ignore air drag, Iphone rotation etc. Use empirical approach instead. Let the device fall from several heights like 1m, 2m, 5m, 10m, 30m... Repeat several times for each height. In each fall measure time. Approximate results by spline. Compute inverse function.

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