# Equilibrium: Introductory Topics

We will be doing a unit on equilibrium. This was actually explored in our dynamics and forces unit. To review what equilibrium means:

https://www.flippingphysics.com/equilibrium.html

One important thing to remember is that when we treat an object as a single mass (instead of a whole bunch of matter stuck together, which most things actually are) we simplify it as though it were a single point at its center of mass:

https://www.flippingphysics.com/center-of-mass.html

Here is a sample problem showing how we solve for translational equilibrium. First, here’s how to solve it using components:

https://www.youtube.com/watch?v=CoJS6dvJEVo

And then, how to solve it using trigonometry instead: