I needed to adjust an accordion to make it look more natural and less snappy. I found lots of "how to use" easing pages with examples obviously but the differences between many of the easing functions like Exponential, Exponential, Linear, Quadratic, Quartic, Quintic and Sine are so small that watching them one at a time yields nothing helpful.

This little app should be helpful in comparing the different options you have. Tweaking options are limited, but enough to give you a good idea of what one to use. I excluded Elastic and Bounce from this example since they were very different from all the others and play a very obvious role/function.