Advertisements
Advertisements
Question
When does an object float or sink when placed on the surface of a liquid ?
Advertisements
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
What is meant by the term ‘buoyancy’ ?
A body while floating sinks deeper in a liquid of low density than in a liquid of high density.
A boy get into a floating boat.
What happens to the buoyant force on the boat ?
What physical quantity is measured in bar?
The S.I. unit of pressure is :
The pressure inside a liquid of density p at a depth h is :
You are provided with a hollow iron ball A of volume 15 cm3 and mass 12 g and a solid iron ball B of mass 12 g. Both are placed on the surface of water contained in a large tub.
- Find upthrust on each ball.
- Which ball will sink? Give a reason for your answer (Density of iron = 8.0 g cm-3)
What do you mean by buoyancy?
Higher Order Thinking Skill.
How does a fish manage to rise up and move down in water?
Most buoyant objects are those with relatively ______.
- high volume
- higher mass
- low density
- less viscosity
