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Date Posted: 22:01:30 02/11/00 Fri
Author: 仇老師
Author Host/IP: bbig014241.netvigator.com / 207.176.121.241
Subject: Re: Why Should we pull the weight " Slightly " in SHM?
In reply to: 光電效應 's message, "Why Should we pull the weight " Slightly " in SHM?" on 21:57:35 02/11/00 Fri

The main reason is that if we pull the spring greatly, the spring is deformed greatly in which it may not obey Hook's Law. Thus, the motion may not be simple harmonic. Pulling slightly can reduce the rate of deformation which can keep the spring moving in SHM.


>>>>oscillate 5 次個period 一樣

SHM is an isochronous oscillation which the period is independent of ampliude if the angle is small. For the same reason apply to spring-mass system, apart from the deformation of spring, SHM occur in this case with "slightly" force (similar to small angle in simple pendulum)so as to obtain isochronous oscillation.

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