Buoyant force makes thing seem to be lighter.

The weight of an object in air is its actual weight

The weight measured when the object is immersed in a fluid is its apparent weight.

The buoyant force is equal to the apparent loss in weight.

The object displaces a volume of water.

The bigger the volume of the object immersed, the bigger the volume of the liquid displaced.

• Volume of liquid displaced = volume of the submerged part of the object.

An object weights 2.5 N. When it is fully submerged in a liquid, its apparent weight is 2.2 N.

(a) What is the buoyant force on the object in water?

(b) What is the weight of water displaced by the object?

(c) Determine the volume of water displaced by the object.

[density of water = 1000 kgm

(d) What is the volume of the object?

The weight of an object in air is its actual weight

The weight measured when the object is immersed in a fluid is its apparent weight.

The buoyant force is equal to the apparent loss in weight.

The object displaces a volume of water.

The bigger the volume of the object immersed, the bigger the volume of the liquid displaced.

• Volume of liquid displaced = volume of the submerged part of the object.

**Work example :**An object weights 2.5 N. When it is fully submerged in a liquid, its apparent weight is 2.2 N.

(a) What is the buoyant force on the object in water?

*Tips : Fb= Wc- Wa*(b) What is the weight of water displaced by the object?

*Tips : Weight , W = mass, m x gravitational force, g**In SPM take g = 10 Nkg*^{-1}(c) Determine the volume of water displaced by the object.

[density of water = 1000 kgm

^{-3}]*Tips : Density = mass / volume*(d) What is the volume of the object?

*Tips : Volume of liquid displaced = volume of the submerged part of the object.*
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