- #1

bhsmith

- 37

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**proof of equilibrium equations??**

## Homework Statement

I have a statics test tomorrow, and I have to give a proof type answer of how the equilibrium equations (sum of forces and sum of moment are zero) are derived.

## Homework Equations

## The Attempt at a Solution

I'm not sure how to do this, I understand that

because the system is in equilibrium then the acceleration is zero and Force=mass(aceleration) which would imply that mass is zero. But I don't think I'm going about that the right way.

As for the moment, I'm not sure what to do.

The way he did it in class was using Newtons first and third laws to prove it, but I didn't quite understand how he went about it.

Thanks for any help!