Advertisements
Advertisements
Question
When does an object float or sink when placed on the surface of a liquid ?
Solution
When an object is placed on the surface of water, two forces act on the object:
(i) The gravitational force that act in the downward direction.
(ii) The upthrust or the buoyant force that act in the upward direction.
An object floats on the surface of water if the upthrust of water on the object is greater than the weight of the object. An object sinks if the weight of the object is greater than the upthrust of water on the object.
APPEARS IN
RELATED QUESTIONS
The S.I. unit of density is ..........
The weight of a body floating in a liquid is ........
What is the cause of buoyant force ?
Write an expression for the pressure at a point inside a liquid. Explain the meaning of the symbols used.
Complete the following sentence :
Pressure at a point inside the liquid is ...................... To its depth.
How is the upthrust related to the volume of the body submerged in a liquid?
A homogeneous block floats on water (a) partly immersed (b) completely immersed. In each case state the position of centre of buoyancy B with respect to the centre of gravity G of the block.
Figure shows the same block of wood floating in three different liquids A, B and C of densities ρ1, ρ2 and ρ3 respectively. Which of the liquid has the highest density? Give a reason for your answer.
Write about buoyant force.
Salt water provides less buoyant force than freshwater.
