Question

10. Draw a diagram to show the forces acting on a body
floating in water with its some part submerged. Name
the forces and show their points of application. How
is the weight of water displaced by the floating body
related to the weight of the body itself ?
11. What is centre of buoyancy ? State its position for a
floating body with respect to the centre of gravity of
body.
12. A balloon filled with helium gas floats in a big closed
jar which is connected to an evacuating pump. What
will be your observation, if air from jar is pumped
out ? Explain your answer.
holloon will sink
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Answer 1

Answer:

12.As air is pumped out from jar, the density of air in jar decreases, so the upthrust on balloon decreases. As weight of balloon exceeds upthrust on it, it sinks.

11.In case of a floating body, the centre of buoyancy is at the centre of gravity of the immered part of a floating body in the liquid, and lies vertically below the centre of gravity of the whole body.

10.The forces acting on the body are:

The forces acting on the body are:Upthrust due to water acting upwards

The forces acting on the body are:Upthrust due to water acting upwardsWeight of the body acting downwards

The forces acting on the body are:Upthrust due to water acting upwardsWeight of the body acting downwardsThe weight of the water displaced by the floating body is equivalent to the weight of the body.

digram is on the top.

Answer 2

THE FORCES ACTING ARE LISTED BELOW:

I. Weight of the body acting downwards.

ii. Upthrust due to water acting upwards.

weight of water displaced by the floating body = weight of the body.

Concept: Principle of Floatation (Law of Floatation)

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