this post was submitted on 14 Mar 2026
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it's pi day (pieguy.sdf.org)
submitted 4 days ago* (last edited 4 days ago) by pieguy@lemmy.sdf.org to c/funhole@lemmy.sdf.org
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You are legally required to consume some form of pie today.

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[–] pmjv@lemmy.sdf.org 2 points 2 days ago (1 children)

explain why the red line is not the same as the line in the original content, if the circles are moving the same way

[–] jdr@lemmy.ml 0 points 2 days ago (1 children)

Tricky, right?

It's because there is "friction" and the part of the circle touching the line can't move relative to it, and so you get that "cusp" shape.

Maybe someone else can give a better explanation, I haven't had any coffee yet.

[–] pmjv@lemmy.sdf.org 2 points 2 days ago

oh right, i see it now. in the original post, the line goes through the ball! thanks!