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प्रश्न
When does an object float or sink when placed on the surface of a liquid ?
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उत्तर
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.
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संबंधित प्रश्न
What is the other name of buoyant force ?
What causes buoyant force (or upthrust) on a boat ?
A body sinks in a liquid A but floats in a liquid B. The density of liquid A is ....... than the density of liquid B.
A body X sinks in water, but a body Y floats on water. The density of the body X is ......... than the density of body Y.
A hammer exerts a force of 1.5 N on each of the two nails A and B. The area of cross section of tip of nail A is 2 mm2 while that of nail B is 6 mm2. Calculate pressure on each nail in pascal.
What do you understand by the term upthrust of a fluid? Describe an experiment to show its existence.
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)
Is thrust a scalar or vector quantity?
If the buoyant force is less, the object will float.
