Pressure.

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Presentation transcript:

Pressure

Objectives What is pressure? Everyday examples? How do we calculate pressure?

Why do camels have wide, splayed feet?

Why do Inuit wear snowshoes when walking in soft snow?

Why does a drawing pin have a large flat head and a sharp, pointed end?

How do we calculate pressure?

Pressure Formula Force (N) Pressure = (N/m2) Area (m2) Force (N) (N/cm2) Area (cm2)

F   P A x P = F  A

Examples A person weighs 650N. They measure the area of their foot to be 325cm2. What is the pressure under each foot? Answer: they have 2 feet, so total area is 650cm2 P = F  A = 650  650 = 1N/cm2

How would pressure change? If you decreased the area? If you increase the force?

What two suggestions would you make? A friend is caught in quicksand.