Pressure

1

Force & Pressure

Objective:

Define & calculate pressure and distinguish from force.

F A

P  =   

Pressure measures how much force is distributed over a certain area.

Force & Pressure

Units: N/m2 or Pascal (Pa), psi - lbs/in2

Ex. water pressure, air pressure

A = .5 cm2

FA = 10 N

A = .01 cm2

 

FA = 10 N

Pressure Examples

A = .01 cm2 

P = F = 700 NA .01 cm2

P = 70,000 N/cm2

Pressure Example

A = .01 cm2 

P = F = 700 NA .01 cm2 3

P = 23,333.3 N/cm2

   

Pressure Example Bed of Nails

Pressure

2

Bed of Nails Assignments . . .

­ Chapter 4 HW #22­24