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.
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.
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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