What is Buoyancy? | Physics | Don't Memorise?

Buoyancy is when something floats because it pushes water out of the way, like a boat on a lake.

Imagine you're in a swimming pool. When you jump in, you push water up, that’s what makes you float! Now picture a toy boat floating on the surface. The boat doesn’t sink because it displaces some water, meaning it pushes water out of its way. The more water it pushes out, the more it can float.

If you put a heavy rock in the pool, it sinks because it doesn’t push enough water up to balance its weight. But if you put a lighter object, like a rubber duck, it stays on top because it pushes just enough water to keep itself afloat.

Think of buoyancy like playing with a bath toy: the more water it moves, the easier it floats! If the toy is too heavy, it goes down, but if it's light, it bounces back up. That’s how boats work too, they push water out so they don’t sink!