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# Pressure and moments5. sceince

Published on: Mar 4, 2016
Published in: Education

#### Transcripts - Pressure and moments5. sceince

• 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