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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.

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Section A.3

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  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?

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