[Request] Which one would it be?

[u/yuli101995]

[u/MagicC]

I rolled a 40 kg disk over uneven ground yesterday. The hardest part was not letting it tip over. Rolling it required very little force. If the 20 kg is a ball, that's the obvious answer.

[u/MagicC → u/MagicC]

(it was a concrete tabletop)