Pressure Definition Physics:
Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.
We are giving a detailed and clear sheet on all Physics Notes that are very useful to understand the Basic Physics Concepts.
What is Pressure in Physics? | Definition, Formula, Examples Units – Hydrostatics
Pressure Formula:
Pressure of liquid at a point is
p = \(\frac{\text { Thrust }}{\text { Area }}=\frac{F}{A}\)
Pressure is a scalar quantity
Pressure Unit:
SI unit is Pascal denoted bt pa
1 pa = Nm-2
Pressure Dimensional Formula:
Dimensional formula [ML-1T–²].
Examples of Pressure in Physics
Pressure Examples in everyday life – High Pressure:
1. Nails, needles and pins have very sharp ends with very small surface areas. When a force is applied to the head of a nail, the pressure will drive its sharp end into a piece of wood easily.
2. The studs on a football boot have only a small area of contact with the ground.
3. The pressure under the studs is high enough for them to sink into the ground, which gives extra grip.
4. If you turn the blade so the cutting edge is pressed into the fruit.
Pressure Examples in everyday life – Low Pressure:
1. Skis have a large area to reduce the pressure on the snow so that they do not sink-in too far.
2. A tractor moving on soft ground has wide tires to reduce the pressure on the ground so that they will not sink into the ground
Hydrostatics:
Hydrostatics is a property of liquid or fluid in mechanics. A fluid is a material which flows at room temperature, because its upper molecule overlaps the inner molecule, which tends to flow the liquid in forward direction. In hydrostatics, we will learn about the condition of fluids when it is in rest or exerted by an external force. Here we will study the fluids in motion.
| Properties of Fluids | Thrust |
| Pressure | Pressure Exerted by Liquid |
| Buoyant Force | Pascal’s Law |
| Archimedes’ Principle | Law of Floatation |
| Density | Relative Density |
| Density of a Mixture |