Buoyancy and Archimedes' principle
The Archimedes' principle was named after Greek philosopher Archimedes.
The principle is closely related to buoyancy as you can see in the
Here is what Archimedes states:
The buoyant force acting on an object that is submerged in water is equal to the weight of the liquid the object displaces.
Whether the object is partially submerged or not, the principle is still true.
example, suppose you submerge a rock in water whose weight is 10 pounds
and the water that is displaced has a weight of 4 pounds, what is the
Since the rock displaced 4 pounds of water and the
buoyant force is equal to the weight of the liquid that the object
displaces, the buoyant force is 4 pounds.
Notice that it is not
the weight of the object that determine the buoyant force, but the
weight of the displaced water. This situation is illustrated in the figure above.
The strength of the force beneath the rock that pushes the rock up is equal to 4 pounds.
Other real life examples of Archimedes' principle.
- You fill your bathtub with water and you submerge your body in
the bathtub. Some water will spill on the ground. The weight of the
water that fell on the floor is equal to the buoyant force that pushes
your body up.
- A boat on a river will be partially
submerged. The boat will displace an amount of water even if it is
small. The weight of the water that was displaced is equal to the
buoyant force at the bottom of the boat.
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