https://developer.roblox.com/api-reference/datatype/PhysicalProperties
Although friction and elasticity may be self-explanatory for power users, there’s still some confusion about what each property does. See the question on this thread and the responses on it.
I vaguely remember the old wiki having animations for each property. Maybe those could be ported to the devhub?
While I can’t seem to find the animations used for visually describing these properties, I did give a substantial update to the PhysicalProperties page:
The properties section now gives a bit more information too, hopefully without sounding like physics lecture 
If you have any suggestions, I’m all ears – I want this page to be as helpful as possible. I’ll also cross post this update in the thread you linked. I’ll see what I can do to get some animations on the page, as well. Generally animations tend to be more useful for tutorials than for docs like this one, but I think I can make an exception here.
Edit: I’ve fixed a couple typos in the above screenshots, rest assured they’ll be visible when this update is published to live in a day or so.
On the paragraph after the equation for ActualFriction, the last sentence, "When the weight of A is much greater than that of B, the actual value." looks unfinished.
There’s also the special case for when the Friction/ElasticityWeight of both objects are zero. The engine treats them as having the same non-zero friction weight instead.
(Thanks for the update!)
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