Question

state the law arrived at from the above experiment.
object :stone,weight in air:3n,weight in water:2.8n,buoyant force:0.2n,weight the displaced water:0.2n object iron block ,weight in air :4.2,weight in water,:3.9,buoyant force:0.3,weight of the displaced water:0.3​

Answer 1

Answer:

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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-2

Weight of a body = Mass x acceleration due to gravity

W = mg

When 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 D

Weight of liquid displaced = Volume x Density x g (acceleration due to gravity)

W = V x D x g

The 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.

Materials Required

A spring balance, a metal bob, a cotton thread, an overflow can, a glass beaker, tap water, salty water, an iron stand.

Procedure

A. Find the zero error and least count of spring balance:

Take an iron stand and suspend a spring balance to it.

Study the spring balance, its scale and its least count.

Record your observations. If any error, record it as ‘x’ gf.

Answer 2

Answer: archimedes principle is the answer