1 / 11

Section A.3

Section A.3. Pressure. Pressure. Refers to force and space Pressure = force/area. Would you rather?. Pressure = force/area Have a 180 pound person or a 110 pound person step on your foot? What if the 110 pound person was wearing spiky heeled shoes?. Air pressure.

onan
Download Presentation

Section A.3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Section A.3 Pressure

  2. Pressure • Refers to force and space • Pressure = force/area

  3. Would you rather? Pressure = force/area • Have a 180 pound person or a 110 pound person step on your foot? • What if the 110 pound person was wearing spiky heeled shoes?

  4. Air pressure • Gas molecules exert pressure on their surrounding • Units to report air pressure: • psi • mmHg • atm • torr

  5. SI units of pressure • Force = Newton (N) • Area = meter squared (m2) • Pressure = N/m2 : called a pascal (Pa)

  6. What causes air pressure in a tire or any sealed container? • The air molecules are moving and bounce off the sides of the container. These collisions exert a force on the walls of the container.

  7. Measuring air pressure • Use a barometer typically with mercury in it.

  8. Typical air pressure measurements at sea level • 101.3 kPa • 1 atm • 760 mmHg • Air pressure video

  9. In Osseo, MN, the Earth’s atmosphere has a force of about 15 pounds per square inch (psi).

  10. Calculating pressure Pressure = force/area • Calculate the pressure of a block that is exerting a force of 18 N that has the measurements of .25 m x .5 m.

  11. Calculating pressure Pressure = force/area • What pressure is exerted by a block that weighs 25 pounds and is 3 inches x 5 inches?

More Related