AnswerThe first sports balls were made with leather or pigskin.
Well most of the sports use gravity especially the ones when you have to not touch the ground at some point. Sports like darts don't use gravity because there feet are always on the ground.
they both use my balls :3
Squash balls can be purchased online through a variety of websites such as Amazon and Sports Chalet. Squash balls are also available at many local sports and athletics stores such as Sports Authority or Academy Sports.
"Bouncing into Science: Investigating the Physics of Sports Balls"
Balls
there is a game called bingro. in the game you put bingo balls in your mouth and spit them out.
pretty sure none unless theres homeless people that make balls out of trees that live there.
The Sports Authority website does sell Pilates exercise balls. They offer both stability and toning balls in a variety of sizes and weights.
Swimming
A variety of balls for sports can in most cases be found in local sport stores. Otherwise Amazon and eBay provide a comfortable way to order balls online.
There is one simple purpose for balance balls. This invention is for exercising. However, some people use it as a toy even though it does not make for a great toy.