Important points to remember :
1. Force :
Force is required to ( 1 ) move a stationary object ( 2 ) stop a moving object ( 3 ) change the velocity and speed of an object ( 4 ) change the size and shape of an object.
Pressure :
The force applied on unit area is called pressure.
Pressure = force/area
The unit of pressure is the newton per square metre ( N / m^2 )
Pressure affects substances in the solid state, liquid state, as well as the gaseous state.
A fluid substance exerts equal pressure in all directions.
A fluid flows from a region of higher pressure to a region of lower pressure.
The pressure exerted by the atmosphere is term as atmospheric pressure.
The working of a pump, a spray pump, etc., is based on atmospheric pressure.
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