What causes buoyant force (or upthrust) on a boat?

Q. (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 = 10 m s⁻²)

Q. The upward force exerted on a body by the fluid in which it is submerged, is called upthrust or buoyant force.

Q. A boat is floating in the river. What happens to the buoyant force on the boat if a man gets into this boat?

Q. A boy gets into a floating boat.

(a) What happens to the boat?
(b) What happens to the weight of water displaced?
(c) What happens to the buoyant force on the boat?

Q. (a) State the principle of flotation.
(b) A floating boat displaces water weighing 6000 newtons.
(i) What is the buoyant force on the boat?
​ (ii) What is the weight of the boat?