Give two practical daily life applications that make use of the concept of pressure.
Practical applications based on the concept of pressure: (i) As we know, the area of a sharp edge is much less than that of a blunt edge. Thus, for the…
What do you mean by thrust?
Thrust is the force acting on a body perpendicular to its surface. It has the units of force. The SI unit of thrust is newton (N). Effect of thrust depends…
The relative density of a body is 2. Will is sink or float in water? Give reason for your answer?
The relative density of a body is 2. It is greater than relative density of water. Hence it will sink because it means that upward thrust of water is less…
The volume of a body of mass 50 g is 20 cm3 . If the density of water is taken as 1 gcm-3 , will the substance float or sink in water? Why?
It will sink. The weight of the body is greater than the weight of water displaced by it.
A body is fully immersed in water to a depth of 2m, 4 m and then 5 m, in turn. Will the loss in its weight be equal or different in three cases? If different, in which case will it be least?
The loss in its weight will be equal in all the cases.
Do all bodies immersed in a given fluid experience the same buoyant force?
No, as they will displace different weight of the fluid.
Why does an egg sink in freshwater but floats in highly salty water?
Salty water is denser than freshwater, hence the egg experiences greater upthrust
When an object is immersed in a fluid, name the two forces acting on it.
(i) Downward gravitational force and (ii) upward buoyant force.