Buoyancy is the tendency of an object to float or sink in water or any other fluid. Whether an object is buoyant is determined by Archimedes’ Principle which states that any object in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the object. When the orange is placed in water there are two forces working upon it in opposite directions. Gravitational force pulls the orange down while buoyant force pushes it upwards. Gravity pulls the orange down with a force equal it the weight of the orange.