LABACTIVITY - Floating Bodies -CLASS 9

 PROOF OF ARCHIMEDES PRINCIPLE USING VARIOUS LIQUIDS

Aim : To prove Archimedes principle using various liquids.

Required material : Overflow jar, stone, spring balance, beaker etc.,

Principle : A body immersed in a liquid losses weight by an amount equal to the weight of the liquid displaced.

Weight of a solid in air – weight of solid when immersed in liquid = Loss in weight of the solid

Loss in weight of the solid = weight of the liquid displaced

Procedure:

1) We take a stone and find the weight of the stone with spring balance.

2) Then we take water in the overflow jar.

3) We Dip the stone in the water and find the weight.

4) The weight of the stone decreased.

5) We find the loss in weight of the stone.

6) We find the weight of the water displaced in the beaker.

7) Clean the overflow jar and do the above experiment with kerosene.

Observations:

When stone dipped in the water:

Weight of the stone in air = ............. gm weight

Weight of the stone when immersed in water = ............. gm weight

Loss of weight of stone = ............. gm weight

Weight of the empty beaker = ............. gm weight

Weight of the water displaced and beaker = ............. gm weight

Weight of the water displaced = ............. gm weight

Loss in weight of the stone = weight of the water displaced

When stone dipped in the kerosene:

Weight of the stone in air = ............. gm weight

Weight of the stone when immersed in kerosene = ............. gm weight

Loss of weight of stone = ............. gm weight

Weight of the empty beaker = ............. gm weight

Weight of the kerosene displaced and beaker = ............. gm weight

Weight of the kerosene displaced = ............. gm weight

Loss in weight of the stone = weight of the kerosene displaced

Result: A body immersed in a liquid losses weight by an amount equal to the weight of the liquid

displaced. If the density of the liquid increases, the buoyant force also increases.

Precautions:

1) Dip the stone slowly in the overflow jar.

2) Note the readings without parallax error.