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Pressure on a surfacePressure on a surface
? P = Normal force / areaP = Normal force / area
? Unit: NmUnit: Nm-2-2
? S.I. unit: Pascal (Pa)S.I. unit: Pascal (Pa)
? Scalar quantityScalar quantity Normal force
? P = force / surface area in contactP = force / surface area in contact
? P = weight / base areaP = weight / base area
? Area Increase, Pressure decreaseArea Increase, Pressure decrease
? Area decrease, Pressure increaseArea decrease, Pressure increase
Ȧ
F FcosȦ
P = FcosȦ / Area/ Area
Application ofApplication of
Pressure in our dailyPressure in our daily
lifelife
Area Increase, Pressure decreaseArea Increase, Pressure decrease
? Snow shoes C broad base to reduce pressure CSnow shoes C broad base to reduce pressure C
prevent sinking into the snow.prevent sinking into the snow.
? Large elephant leg C able to walk on muddyLarge elephant leg C able to walk on muddy
ground without sinkingground without sinking
? Tractors tyreTractors tyre
? Broad based foundation of buildingBroad based foundation of building
Area decrease, Pressure increaseArea decrease, Pressure increase
? Knife, scissors, nail, thumbtacksKnife, scissors, nail, thumbtacks
? Ice skating bootIce skating boot
? Foot ball boots with studsFoot ball boots with studs
Pressure on surface
? Woodpecker C sharp beak enable it to pierce andWoodpecker C sharp beak enable it to pierce and
chip tree barkchip tree bark

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Pressure on surface

  • 1. Pressure on a surfacePressure on a surface ? P = Normal force / areaP = Normal force / area ? Unit: NmUnit: Nm-2-2 ? S.I. unit: Pascal (Pa)S.I. unit: Pascal (Pa) ? Scalar quantityScalar quantity Normal force
  • 2. ? P = force / surface area in contactP = force / surface area in contact ? P = weight / base areaP = weight / base area
  • 3. ? Area Increase, Pressure decreaseArea Increase, Pressure decrease ? Area decrease, Pressure increaseArea decrease, Pressure increase
  • 4. Ȧ F FcosȦ P = FcosȦ / Area/ Area
  • 5. Application ofApplication of Pressure in our dailyPressure in our daily lifelife
  • 6. Area Increase, Pressure decreaseArea Increase, Pressure decrease ? Snow shoes C broad base to reduce pressure CSnow shoes C broad base to reduce pressure C prevent sinking into the snow.prevent sinking into the snow.
  • 7. ? Large elephant leg C able to walk on muddyLarge elephant leg C able to walk on muddy ground without sinkingground without sinking
  • 9. ? Broad based foundation of buildingBroad based foundation of building
  • 10. Area decrease, Pressure increaseArea decrease, Pressure increase ? Knife, scissors, nail, thumbtacksKnife, scissors, nail, thumbtacks ? Ice skating bootIce skating boot
  • 11. ? Foot ball boots with studsFoot ball boots with studs
  • 13. ? Woodpecker C sharp beak enable it to pierce andWoodpecker C sharp beak enable it to pierce and chip tree barkchip tree bark