Question

Form a sentence using the terms: Archimedes principle, buoyant force.

Answer 1

Hint: Usually when objects are immersed in liquid they experience some kind of upward force. They displace some liquid on immersion. The force that they experience is called buoyant force and the quantity of the displaced liquid is given by a relation derived from Archimedes’ Principle.

Complete step by step answer:
When an object is immersed in water, it experiences an upward force. This force is exerted by the liquid on the object. This force is called buoyant force.
It is the buoyant force which makes the objects seem lighter in air. It is through this force that many objects are able to float in water. If it weren’t for buoyant force, objects wouldn’t be able to float. The buoyant force experienced by each object differs from another object due to various factors.
The magnitude of the buoyant force acting on an object immersed in liquid depends on the following two factors:
(i)Volume of the object that has been immersed
(ii)Density of the liquid in which it is immersed

Archimedes Principle: It states that: ”When an object is partially or wholly immersed in a liquid ,the buoyant force experienced by it is equal to the liquid displaced by the object”. Mathematically,
$F_B$= Weight of the liquid displaced by the object.
$F_B$=(mass of liquid displaced)$\times$ $g$
$F_B$=$\rho Vg$
where $F_B$=buoyant force
$g$= acceleration due to gravity
$V$= Volume of displaced liquid
ρ =density of liquid
The magnitude of the buoyant force is given by Archimedes Principle.

Applications of Archimedes’ Principle:
(i)It is used in determining the relative density of substance.
(ii)It is used in designing ships and submarines.
(iii)Principle of floatation is derived from Archimedes’ Principle.

Note: Even gases exert an upward force (or buoyant force) on the objects placed in them but in most cases it is so small that we tend to ignore it. The hot air balloon rises up in the air because of an upthrust force acting on it.