Upthrust in fluids: Buoyancy, experiment, conditions required, characteristic properties, reason for upthrust and mathematical proof.
UPTHRUST IN FLUIDS Upthrust The upward force exerted on a body by the fluid in which it is submerged, is ca lled the upthrust force in liquids or buoyant .Upthrust in liquid is denoted by the symbol F B . The property of liquid to exert an upward force on a body immersed in it,is called buoyancy . EXPERIMENT Need : A empty can with a air tight stopper on its open end. A container filled with water. An empty can on water Working : Put the can over the water Observation : It can be seen that the can with its larger portion floats over the water and a smaller portion of is inside the water. On pushing the can inside the water it tries to come out because of the upthrust on it. It is also noticed that more and more the can is pushed greater the upthrust becomes. When the can is completely inside the water a constant force is required to keep that...