Q55 of 176 Page 125

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 Newton? (g = 10 m s-2)

Mass of water displaced = 600kg

Weight of water displaced, W =m x g


=600 x 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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Define buoyant force. Name two factors on which buoyant force depends.

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What is the cause of buoyant force?

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State the principle of flotation.

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A floating boat displaces water weighing 6000 Newton.

(i) What is the buoyant force on the boat?


(ii) What is the weight of the boat?