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Class 10 > Learn Class IX-X Tuition > Why does an object float or sink when placed on the...
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Why does an object float or sink when placed on the surface of water?

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An object float or sink depends on its own density and the density of the liquid which it is placed in.
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it is because of law of buoyancy
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Math Ninja, Verbal Wizard, Chef and proud to be a geek.

Hey samadhan, An object may float or sink when placed on the surface of water because of the principle of buoyancy. Which is quite simply the upward force that is exerted on an object by the fluid on whose surface the object is placed. Let's take a very simple example of a paper boat placed on a water....
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Hey samadhan, An object may float or sink when placed on the surface of water because of the principle of buoyancy. Which is quite simply the upward force that is exerted on an object by the fluid on whose surface the object is placed. Let's take a very simple example of a paper boat placed on a water. The boat at all times experiences a force that is upward in direction from the water. This force is exerted because the water is resisting the weight of the boat. This force increases as we go deep in to the water. That is why it is highly unlikely that a paper boat will not sink near the bottom of the water body, because its weight is not able to resist the higher force at the bottom, but it can resist the weaker force at the top. Any object whose density is greater than the fluid in which it is placed, will sink. That is why a heavy boat made of metal will sink when placed in a small tumbler of water, because the weight of the boat is more than the buoyant force that the water is exerted in this case. However, a big ship made of metal is afloat in a sea because the buoyant force in this case is balanced by the weight of the ship. The shape of the object also places an important role and a boat also because of its aerodynamics manages to stay afloat on water. The archimedes principle explains this very succinctly. "Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object." read less
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Based on the volume of water it displaces ---the object floats or sinks, Boyance rule.
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An object will float when its density is equal to that of the liquid and An object will sink in liquid if its density is more than that of the liquid Mark if u like my answer
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Shankar Chaudhary

the property of an object to float on water is called buoyancy Buoyancy is dependent on the difference between the density of water and the object. (Density is ratio of mass to volume.) if the density of an object is greater than water ( density of water is 1) eg.iron = 7 ,will not float if the...
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the property of an object to float on water is called buoyancy Buoyancy is dependent on the difference between the density of water and the object. (Density is ratio of mass to volume.) if the density of an object is greater than water ( density of water is 1) eg.iron = 7 ,will not float if the density of an object is less than water eg. wood=0.7 ,it will float on water read less
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If the density of an object is more than the density of the liquid, then it sinks in the liquid. Archimedes' principle reasons this statement. It is because the buoyant force acting on the object is less than the weight of the thing.If the density of an object is less than/equal to the density of the...
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If the density of an object is more than the density of the liquid, then it sinks in the liquid.
Archimedes' principle reasons this statement. It is because the buoyant force acting on the object is less than the weight of the thing.
If the density of an object is less than/equal to the density of the liquid, it floats on the surface of the liquid. It is because the buoyant force acting on the object is similar to the weight of the object.

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Due to its High or low density compared with water
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I am GATE (2013) qualified. I have completed my M.Sc. in Biotechnology in the year 2010 and M.Tech in biotechnology in the year 2012 and pursing PhD at present from ICAR institute.

Based on the surface area of the object
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If the buoyant force is more than the weight of object, then the object will float on water. If buoyant force is less than the weight of the object, then the object will sink in water. This upward force acting on the object, when an object is immersed in water is called the buoyant force
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