Ball
device · 1600 BC · Ancient world
Rubber balls of the Mesoamericans; leather balls in Europe.
What it is made of
- Ball cover — has part. The casing.
- Inner tube — has part. A chamber with air.
Principles and materials it uses
- Natural rubber — is made of. The rubber balls of Mesoamerica.
- Elasticity — uses. Bouncing back thanks to elasticity.
Where it is used
- Tennis racket — is used in. A ball.
- Basketball hoop — is used in. A ball.