Name the force due to which every object fall on earth?


The force due to which every object falls on earth is called the force of Gravity. 
Force of gravity is an attractive force. 

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What do you mean by pressure?


Pressure is the force acting on a unit area of a surface.

Mathematically, it is given by

                 Pressure = ForceArea  = FA

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Why is the edge of the nails made sharp?


Edge of nails is made sharp(less area) so that the object experiences more pressure. This makes easier for a person to penetrate the wood with the force of a hammer. 

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Why do camels have broad feet?


Camels have broad feet i.e., feet having a large are so that the pressure exerted on the sand is less due to their heavy weight. 

We know that, 

Pressure = ForceArea

Therefore, camels do not dig deep in the sand dunes and can move freely.

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How can we increase the pressure by exerting same force?


Mathematically, pressure is given by,

               Pressure = ForceArea 

Pressure can be increased by decreasing the area of the surface on which force is to be applied. 

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