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Force on a particle constrained to move on the surface of a sphere

by silmaril89
Tags: classical dynamics, force, marion, thornton
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K^2
#19
May27-12, 01:06 PM
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Quote Quote by Vanadium 50 View Post
But this is not orbital mechanics.

This is Chapter 2 in Marion and it should be answered at a level appropriate to Chapter 2 in Marion. We should try and make this concept clear, and not drown the OP in advanced "yeahbuts".
That doesn't mean you can claim that radial acceleration is zero when it's not. It means you can claim that radial acceleration is irrelevant.
haruspex
#20
May27-12, 05:13 PM
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Quote Quote by Vanadium 50 View Post
In this formulation, the constraining force is not part of the problem, and there is no net force in the r-direction, because r is constant.
K^2 is right. There is a net force in the radial direction, but it is not relevant to the problem. Saying there is no net force is not making things easier for beginners - it just creates confusion.
Rap
#21
May27-12, 07:42 PM
P: 789
Quote Quote by K^2 View Post
That doesn't mean you can claim that radial acceleration is zero when it's not. It means you can claim that radial acceleration is irrelevant.
Quote Quote by haruspex View Post
K^2 is right. There is a net force in the radial direction, but it is not relevant to the problem. Saying there is no net force is not making things easier for beginners - it just creates confusion.
Yes.


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