A glass ball bounces higher than a rubber ball of the same size,
providing it does not break. A steel
ball will also bounce higher than a rubber ball. Bouncing is a form of elastic collision between two objects. When you
drop a ball, it will only bounce if it gets back the energy it imparted
to the surface it hit. Many objects dissipate energy too readily to
bounce well.
When a rubber ball hits a surface, it compresses and deforms before
returning to its original shape. Quite a lot of energy is lost in this
process. Glass is rigid and does not deform much when it
strikes a surface. Most of the energy of the impact returns to the
glass. Steel is crystalline, especially hardened steel containing
carbon, so it deforms slightly but retains a lot of the collision
energy. Of course, the bouncy advantage is lost if a glass or steel ball
is hurled with force because glass will break and dense steel will have
enough momentum to become a weapon.
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