We normally see,whenever a body is placed over a Liquid,either it sinks or floats on the Liquid.

The body placed over the Liquid is subjected to the following two forces.
01)Gravitational force.
02)Upthrust of the Liquid.

These two forces acts opposite to each other.If the Gravitational Force is more than the Upthrust of the Liquid,the Body will sink down,if theGravitational
Force is less than the Upthrust of the Liquid,the Body will float.This will best understood by the Archimede’s Principle.

01)Archimede’s Principle:-
It states that “Whenever a body is emmersed wholly or partially in a Fluid,it is lifted up by a force equal to a Weight of Fluid Displaced by the Body”.

02)Buoyancy:-
The tendensy of a Fluid to uplift a submerged body,because of upward thrust of the Fluid,is known as Buoyancy.It is always equal to the Weight of Fluid
Displaced by the Body.

If the Force of the Buoyancy is less than the Weight of the Body,it will sink down.When  the Force of the Buoyancy is more than the Weight of the Body,
it will pushed up till the Weight of the Fluid Displaced is equal to the Weight of the Body.

03)Centre Of Buoyancy:-
It is the point,through which the force of the Buoyancy is supposed to act.It is always the Centre of Gravity of the Volume of the Liquid Displaced.

04)Metacentre:-
Whenever a body,floating in a Liquid,is given a small angular Displacement,it starts Oscillating about some point.This point,about which Body starts
Oscillating,is known as “Metacentre”.

05)Metacentric Height:-
The distance between the centre of Gravity of a floating Body,and the Metacentre is called “Metacentric Height”.More the Metacentric Height of floating
Body,more it will be stable.

For more,please visit
http://mechanicalguru.blogspot.com/

Last 5 posts by prasannas

• We are the only friend or enemy of ourself. - September 2nd, 2008
• Use power of thinking to understand the rules. - September 2nd, 2008
• Don't forget,you will also die one day. - September 2nd, 2008
• Avoid Breakdown of Air Compressor due to Low Water Flow. - August 26th, 2008
• How to safeguard Air Compressor from Excessive Vibrations. - August 26th, 2008