Buoyancy
What is it?
Buoyancy is the force that keeps a floating object from sinking.
Positive buoyancy is the tendency to float upward. Negative buoyancy is the tendency to sink toward the bottom. Neutral buoyancy is when an object maintains a relatively stable position, not going up or down.
Give me an example!
Have you ever watched a leaf floating in the water? The leaf floats because of buoyancy. The force of the surface tension of the water pushing up against the leaf is greater than the force of gravity pulling down on the mass of the leaf.
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