The SI unit : Nm-2 = Pascal = Pa
*take note --> 1 Nm-2 = 1 Pascal
HOW DOES AREA AFFECT PRESSURE?
1. Effect of a force acting over a small area is the production of high pressure over that area.
2. Effect of a force acting over a large area is the production of a lower pressure over that area.
Applications involving High Pressure
1.A sharp knife has a very small surface area on its cutting edge so that high pressure can be exerted to cut the bread.

2.The studs on a football boot have only a small area of contact with the ground. The pressure
under the studs is high enough for them to sink into the ground, which gives extra grip.


Application involving Low Pressure
1. 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.


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