A ball doesn't actually defy gravity. It's a common misconception. Gravity is a fundamental force of the universe, and it affects everything with mass, including balls.

Here's what actually happens when a ball appears to defy gravity:

* Upward Force: Something must counteract the force of gravity pulling the ball down. This could be:

* Throwing: When you throw a ball upwards, you give it an initial upward velocity. This velocity slows down due to gravity, but for a while, it overcomes the downward pull.

* Buoyancy: If the ball is in a fluid (like water or air), it experiences an upward force called buoyancy. If the buoyancy force is stronger than the force of gravity pulling the ball down, the ball will float.

* Lift: For objects like airplanes, wings are designed to create lift. The shape of the wing forces air to move faster over the top than the bottom, creating a pressure difference that generates an upward force.

* Temporary Suspension: In some situations, a ball might appear to be defying gravity, but it's actually just experiencing a temporary suspension. This can happen when:

* Air Resistance: A ball falling through the air experiences air resistance, which slows its descent. If the ball is light and has a large surface area, air resistance can be significant, making it look like the ball is floating for a short time.

* Magnetic Levitation: A magnetically levitated ball can appear to float, but this is because magnetic forces are counteracting gravity.

In short, no object can truly defy gravity. There are always forces at play, either counteracting gravity or providing a temporary suspension.