ARCHIMEDES' PRINCIPLE

Done by :Gourisankaran Pillai

Grade IX

Archimedes

Archimedes was born in 287 BC at Syracuse, Greece ,one of the most powerful Greek city state. In Syracuse 212BC Archimedes died, by being killed by a Roman soldier who didn’t know who he was. Archimedes had a father who’s name was Phidias. It is believed Phidias could have been related to Hieron the 2nd ,the king of Syracuse. It is not known if Phidias was married or had any children.

Archimedes Principle states that when a body is

immersed partially or fully in a fluid, it experiences an upward force that is equal to the weight of the fluid

displaced by it.

Archimedes’ Principle

What is BUOYANCY

and UPTHRUST?

What is BUOYANCY

and UPTHRUST?

Or upthrust

BOUYANT FORCE or UPTHRUST

WHEN A BODY IS IMMERSED PARTIALLY OR

COMPLETELY INSIDE A FLUID IT EXPERIENCES AN UPWARD FORCE CALLED

THE BUOYANT FORCE

Buoyancy The property of the fluids to apply buoyant force is called

BUOYANCY

The Buoyant force acting on an object depends upon two factors:

The volume of the body immersed i.e. volume of the fluid displaced , or

density of the fluid

Verifying Archimedes’

principleo Take a Eureka can and fill it up to its spout.

Take a stone and suspend it with the hook of the spring balance.Note the weight of stone in air.Let it be w1.

o Now immerse the stone inside water in the Eureka can. The water overflows through the can. Collect this overflowing water in the beaker. Now, also note the reading in the spring balance.Let it be w2.

o This w2 will be less than w1 due to upthrust provided by water. Apparent loss in weight due to upthrust will be (w1-w2).

o Measure the weight of water collected in the beaker , which in fact is the weight of water displaced by the stone .

o On comparing we will find that the loss in weight (w1-w2 ) is equal to the weight of the water displaced by the stone. Hence , The Archimedes' principle is verified.

Applications Of Archimedes Principle

Used in designing ships and submarines Used in making Lactometers, which are used

to determine the purity of a sample of milk Used in making Hydrometers , which are used

for determining density of liquids

THE END