101122 - Physics 121 11/22/10 11/22/10 Physics 121 1...

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Physics 121 11/22/10 Prof. E. F. Redish 1 11/22/10 1 Physics 121 11/22/10 2 Physics 121 11/22/10 3 Physics 121 F A The force takes its direction from A. F pF p A A == ± ± Pressure has no direction! It acts in all directions at once!
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Physics 121 11/22/10 Prof. E. F. Redish 2 11/22/10 5 Physics 121 11/22/10 7 Physics 121 F = p 0 A (could be outside air pressure or due to external weights) A fluid of uniform density p 0 A pA W = m g 11/22/10 8 Physics 121 gd p p pA A p Adg pA A p Vg pA A p mg F F up down ± + = = + = + = + = 0 0 0 0 A d * We assumed uniform density. Is this OK? For water ( ± ~ 1000 kg/m 3 ) yes. For air ( ± ~ 1 kg/m
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101122 - Physics 121 11/22/10 11/22/10 Physics 121 1...

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