Archimedes principle class9 practical hand written with diagrams
Answers
aim
to establish the relation between the loss in weight of a solid when fully immersed in
tap water
strongly salty water, with the weight of water displaced by it by taking at least two different solids.
theory
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 =\frac { thrust }{ area }
s.i. unit =\frac { n }{ { m }^{ 2 } } 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
Explanation:
this is Archimedes principle
hope this may help u
