Question

DEFINE ARCHIMEDS PRINCIPLE IN SIMPLIEST FORM

Answer 1

the absolute value of the buoyant force is equal to weight of fluid displaced.

Answer 2

Just as natan said, when you submerge an object in a fluid, it will displace a quantity (volume) of fluid, and the weight of that fluid that is displaced is equal to the bouyant (upward) force on the object by the fluid.

If you want to think about this a bit more,it's key to remember that it is not the weight of the object that is important but rather the weight of the fluid (or rather, its density) since a beachball would displace a much larger quantity of fluid than a heavy brick, and if you submerged both in molasses they would both displace a volume of fluid with more weight than if you submerge them in alcohol (or a gas), so there is more bouyant force in a dense liquid. To keep an object submerged, the object has to either be heavy enough that the object's own weight overcomes the buoyant force, or the object is pushed down by applying a force to the object.