ELI5: Why basketball bounce?

23 views Dec 10, 2025 2 min read

Imagine you have a balloon filled with air. When you squeeze it, the air inside pushes back, right?

A basketball is kind of like that balloon, but it's made of rubber or leather instead of thin plastic. It's also filled with air under pressure.

When you dribble the basketball, you're squishing it against the ground. This is like squeezing the balloon.

  • The air inside the ball gets compressed or squished.
  • The rubber/leather of the ball also gets squished.
Because air and rubber/leather don't like being squished, they push back with force equal to the force you used to hit the ball against the ground. Think of it like a spring – you push it down, and it bounces back up.
  • The squished air and rubber/leather push the ball back into its original shape.
  • This push sends the ball back upwards, making it bounce.
The bounciness depends on how much air is inside the ball and how good the rubber/leather is. If the ball is flat (not enough air), it won't bounce much because there isn't enough air pressure to push back strongly. A good quality ball will bounce higher, because the rubber/leather is more elastic and can store more energy when squished and then release it to bounce the ball back up.

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