Buoyancy

→ The upward force experienced by an object when it is immersed into a fluid is called force of

buoyancy.

→ It acts in upward direction and it depends on the density of the fluid.

→ When force of gravitational attraction of the earth on the surface of the object < buoyant force

exerted by fluid on the surface of the object, object floats in the fluid.

• When force of gravitational attraction of the earth on the surface of the object > buoyant force

exerted by fluid on the surface of the object, the object sinks in the fluid.

→ This is the reason, why allpin sinks and boat/ship floats on the surface of water. (Archimedes

principle)

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