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Situation diagram and free body diagram

by Googl
Tags: body, diagram, free, situation
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May2-11, 05:43 PM
P: 111
Hi all,

What is the difference between a situation diagram and free body diagram? I understand what a free body diagram is.

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Stephen Tashi
May2-11, 10:58 PM
Sci Advisor
P: 3,313
I don't understand what a "situation diagram" is. Perhaps it's any kind of diagram of a physics problem.

For a free body diagram, you pick some object to be the "free body" and then you draw all the forces acting upon the body and do not draw the forces exerted by the body itself. For example if the "free body" is bar is suspended at its ends by threads, you draw the force of gravity on the bar and the force of each thread on the bar. But you don't draw the forces that the body exerts on the threads or the forces that the other ends of the threads exert on the ceiling or whatever is holding them.

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