1. Pressure and Moments
A brief PowerPoint to describe my
understanding of Pressure and
Moments

2. Items that cause high and low pressure.
• Stiletto heels - Pumps.
• Beanbag - Chair.

3. The pressure formula
Pressure (the symbol: P) is the force per
unit area applied in a direction
perpendicular to the surface of an
object. Gauge pressure is the pressure
relative to the local atmospheric or
ambient pressure.
The diagram at right shows a sharp knife and a dull knife in contact with a
surface (maybe a nice, juicy steak!). You know that the sharp knife cuts more
efficiently - Why?
Notice that the sharp knife has a very small area of contact with the surface,
while the dull knife has a much larger area of contact. If both knives are
pushed down with the same force, the sharp knife will exert a much greater
pressure on the surface than the dull knife - and pressure cuts.
So, if you are "stuck" with a dull knife, you have to exert much more force in
order to generate enough pressure to cut your steak, right?

4. Moments
Force multiplied distance from pivot
equals turning moment.

5. John Morgan

6. John Morgan