如何测量自由落体时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覆盖的距离呢?

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，它们会忽略空气阻力、Iphone 旋转等.请改用经验方法.让设备从 1m、2m、5m、10m、30m 等多个高度下落……对每个高度重复几次.在每个秋天测量时间.通过样条近似结果.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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