pressure on surface
TRANSCRIPT
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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
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P = force / surface area in contactP = force / surface area in contact P = weight / base areaP = weight / base area
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Area Increase, Pressure decreaseArea Increase, Pressure decrease Area decrease, Pressure increaseArea decrease, Pressure increase
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θθF Fcosθθ
P = Fcosθθ / Area / Area
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Application of Application of Pressure in our Pressure in our
daily lifedaily life
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Area Increase, Pressure Area Increase, Pressure decreasedecrease
Snow shoes – broad base to reduce Snow shoes – broad base to reduce pressure – prevent sinking into the pressure – prevent sinking into the snow.snow.
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Large elephant leg – able to walk on Large elephant leg – able to walk on muddy ground without sinkingmuddy ground without sinking
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Tractor’s tyre Tractor’s tyre
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Broad based foundation of buildingBroad based foundation of building
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Area decrease, Pressure Area decrease, Pressure increase increase
Knife, scissors, nail, thumbtacksKnife, scissors, nail, thumbtacks Ice skating bootIce skating boot
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Foot ball boots with studsFoot ball boots with studs
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Woodpecker – sharp beak enable it Woodpecker – sharp beak enable it to pierce and chip tree barkto pierce and chip tree bark