Items for Teacher Tips - Githubissues

For #1

I'll edit this list as I think of more items to include in the Teacher Tips.

[x] Stick vs. Slip, #87, #65
[x] If an object is partially out-of-bounds when the Reflecting Border is turned on, it will continue to escape.
[x] Off-screen balls are weird sometimes - #199
[x] Stroke weight represents elasticity, #38
[x] Constant size, including odd behavior if changed after perfectly inelastic collision
[x] Precision, #162, #182
[x] Bump away algorithm, #167
[x] Elasticity affects ball-ball and ball-wall collisions.
[x] How state is saved and implications for reset and step back buttons, #183 & #209
[x] Link to https://github.com/phetsims/collision-lab/blob/master/doc/model.md
[x] Recommend pausing the sim when setting up experiments. Frequent changes while in motion can lead to hard-to-interpret (though accurate) behavior, #176, #178
[x] supportsPanAndZoom and screens
[x] Stepping back only allowed in perfectly-elastic collisions. This is to avoid displaying alternate histories that arise from numerical imprecisions that get magnified significantly for every collision (and glancing collisions magnify it also). - #183

phetsims / collision-lab