because:
* the force of gravity is constant and downward * the acceleration due to gravity is therefore a result of the square of time * horizontal acceleration is zero so the horizontal velocity is constant * y=vyt -at2 x=vxt all this makes a parabola that opens downwards.
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Balls bounce in a parabolic shape due to the influence of gravity and the initial velocity imparted to the ball. When the ball is thrown or dropped, it follows a curved trajectory as it rises and falls back down, creating a parabolic path.
Some examples of balls that don't bounce are medicine balls, bowling balls, and shot put balls.
"Bouncing into Science: The Physics and Chemistry of Bounce Balls"
Some things that bounce but are not balls include rubber bands, springs, and trampolines.
Glass balls tend to bounce higher than rubber balls due to their density and hardness. Glass balls have less energy loss upon impact because they are rigid and less deformable compared to rubber balls. This allows glass balls to retain more of their original kinetic energy during the bounce, resulting in a higher bounce height.
Smaller bouncy balls bounce higher than larger ones because they have less mass and experience less air resistance when they bounce. This allows them to conserve more of their initial energy and bounce higher with each rebound.