Ball rolling down a hill on Make a GIF

Ball rolling GIF - Find on GIFER

File:Tautochrone balls full oscillation.gif - Wikimedia Commons

Where can you walk on a day trip in the countryside?

Physical World, Year 7 and 8 – HatziScience for NSW

Roll Down Hill GIFs - Find & Share on GIPHY

snowballing gif – BrotherBored

Roll Down Hill GIFs - Find & Share on GIPHY

Rolling downhill

Examples