关于重量的问题

henggi

一个1kg completely elastic 的物体和一个1kg completely non-elastic 的物体从相同的高度掉在两个不同的weighing machine上，哪个weighing machine 显示出的reading会比较大？

Mountiho

Since the mass for both cases are fixed, it is not longer mass problem!
In fact, it is a question of types of loading applied.
Load can be applied either by "sudden loading" or "gradually loading",
which depends on contact time.

In this case, an completely elastic object will show a much higher value as compared to an non-elastic object.

F= (change in momentum) / time taken

henggi

谢谢。
那么for non-elastic object，reading是不是只有1kg.
for elastic object, reading 是 dm/dt + 1kg?

Mountiho

原帖由 henggi 于 11-9-2009 01:02 PM 发表
谢谢。
那么for non-elastic object，reading是不是只有1kg.
for elastic object, reading 是 dm/dt + 1kg?

那么for non-elastic object，reading是不是只有1kg.
=>不，因为这不是静态问题!
     The reading may floating for sometime before reaching 1KG.

for elastic object, reading 是 dm/dt + 1kg?
=> No, plz check the definitions of loads! This is also a dynamic problem.