Floating Bodies
Floating Bodies
Floating Bodies: If the weight of the submerged object is greater than the buoyant force, the object will sink. If the weight is equal to the buoyant force acting up on the submerged object, it will remain at any level, like a fish. If the buoyant force is greater than the weight of the completely submerged object, it will rise to the surface and float.
To understand buoyancy the meaning of the term volume of liquid displaced should be clearly understood. If a stone is placed in a container that is full of water, some water will overflow as shown in submerged object always displace a volume of lquid equal to its own volume.
Buoyant force is also called upthrust. Upthrust depends on the density of the liquid, not on the density of the object.
Floating or Sinking of Objects in Liquid:
When an object is immersed in a liquid, then following two forces act on it:
Whether an object will float or sink in a liquid, depends on the relative magnitudes of those two forces which act on the object in opposite directions. There are three conditions of floating and sinking of objects. These are:
(i) If the buoyant force or upthrust exerted by the liquid is less than the weight of the object, the obejct will sink in the liquid.
(ii) If the buoyant force is equal to the weight of the object, the object will float in the liquid.
(iii) If the buoyant force is more than the weight of the object, the object will rise in the liquid and the float.
A wooden block is floating in water contained in a beaker. During the free fall of the beaker, the upthrust on the block will be | |||
| Right Option : D | |||
| View Explanation |
Which of the following are correct : (a) Buoyant force is also called upthrust, it depends on the density of the liquid, not on the density of the object. (b) If the buoyant force or upthrust exerted by the liquid is less than the weight of the object, the object will sink in the liquid. (c) If the buoyant force or upthrust exerted by the liquid is equal to the weight of the object, the object will sink in the liquid. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) If the weight of the submerged object is greater than the buoyant force, the object will sink. (b) If the weight of the submerged object is greater than the buoyant force, the object will float.. | |||
| Right Option : A | |||
| View Explanation | |||
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