•    Whenever a body is placed over a liquid, either it sinks sown or floats on the liquids. This is due to,

(1)    Gravitational force
(2)    Upthrust of the liquid

•    If the gravitational force is more than upthrust force of the liquid the body will sink down.
•    If the gravitational force is less than upthrust force of the liquid the body will float.

The Archimedes’s principle states, “Whenever a body is immersed wholly or partially in a fluid, it is buoyed up by a force equal to the weight of fluid displayed by the body”.

Buoyant force = Weight of the fluid displaced by the body.

•    The tendency of fluid to uplift a submerged body, due to the upward thrust of the fluid is known as buoyancy or force of buoyancy.
•    It is always equal to the weight of fluid displaced by the body.

•    The point at which the force of buoyancy acts is called as centre of buoyancy.
•    If always lies at C.G. of the volume of the liquid displaced

Where       H is the height of body
                  h is submerged height of block i.e. depth of immersion.

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