Question

(a) Define buoyant force. Name two factors on which buoyant force depends.
(b) What is the cause of buoyant force?
(c) When a boat is partially immersed in water, it displaces 600 kg of water. How much is the buoyant force acting on the boat in newtons?
(g=10ms-²)​

Answer 1

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(a) Define buoyant force. Name two factors on which buoyant force depends.

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(a) The upward force acting on an object immersed in a liquid is called buoyant force.

Factors affecting buoyant force:

(i) Volume of object immersed in the liquid,

(ii) Density of the liquid.

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(b) What is the cause of buoyant force?

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The cause of buoyant force is the greater upward pressure exerted by water underneath the object..

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(c) When a boat is partially immersed in water, it displaces 600 kg of water. How much is the buoyant force acting on the boat in newtons?

(g=10ms²

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(c) Mass of water displaced = 600kg

Weight of water displaced, W=m×g

=600×10=6000N

Since, the weight of water displaced by the boat is 6000N, therefore the buoyant force acting on the boat will also be 6000N.

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Answer 2

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(a) The upward force acting on an object immersed in a liquid is called Buoyant force.

Factors affecting Buoyant force:

• Volume of object immersed in liquid.
• Density of the Liquid.

(b) The cause of Buoyant force is the greater upward pressure exerted by water underneath the object.

(c) Mass of water displaced = 600kg

Weight of water displaced = m×g

= 600×10

= 6000N

Since, the water displaced by the boat is 6000N, Thersfore the Buoyant force acting on the boat will also be 6000N.