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# Force and Pressure

Force

A Push or Pull on an object is termed as “Force” it is a vector quantity and its S.I unit is Newton (N)

Effects of Force

Force causes following effects

1. It can change shape of an object.
2. It can change direction of an object.
3. It can change state of motion.

Pressure

Force per unit area is termed as “Pressure”. Its SI unit is Newton per metre square (N/m2) or Pascal (Pa). It is denoted by “P”.
Pressure = $\frac{Force}{Area}$
or, P = $\frac{F}{A}$
where,
P = Pressure
F  = Force
A = Area

Pressure exerted by Solid, Liquids and Gases

• Solid exerts pressure in downward direction only.
• Liquid exerts pressure downward as well as lateral direction.
• Gases exerts pressure in every direction of container.

Atmospheric Pressure

• Pressure exerted by air column is called atmospheric pressure. It is measured by Barometer. Atmospheric pressure is highest at sea level and decreases as we go high.

Important Facts

• Pressure of tyre is measured by Manometer.
• Pressure and area are inversely proportional;

This property is used to make:

• Nail tip pointed.
• Edge of knife, scissor sharp etc.