Question

Find the weight of metal bob immersed in salty water and record the apparent loss in weight.

Answer 1

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Answer 2

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Fluids: Gases and liquids flow and are thus called fluids.Buoyancy: The upward force exerted by fluids on any body is called the buoyant force and this phenomenon is known as buoyancy.Thrust: The force acting on a body perpendicular to its surface is called thrust. S.I. unit is Newton.Pressure: The thrust per unit area is called pressure.

Pressure =

S.I. Unit = or Nm-2. This unit (Nm-2)is also called  Pascal,

.’. 1 Pascal (Pa) = 1  Nm-2Weight of a body = Mass x acceleration due to gravity

W = mgWhen a body is immersed in water or liquid, the body displaces some liquid.The volume of liquid displaced = total volume of the solid.The mass of liquid displaced can be measured as:

Mass of liquid displaced = Volume x Density

M = V x DWeight of liquid displaced = Volume x Density x g (acceleration due to gravity)

W = V x D x gThe body loses some weight when immersed in fluid, it can be found as follows:

Weight of the body in air = W1

Weight of the body when immersed in liquid = W2

Hence loss in weight = W2 -W1

How much will be this upward force/buoyant force depends on the density of liquid in which it is immersed. The upthrust is more by denser liquids.Archimedes’ Principle: When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it