Phys W4 Drag Formulae

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6 Terms

1
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Reynolds #

inertial forces/viscous forces, or (ro→density)(v→speed)(L→size)/(n→viscosity of fluid)

2
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what does a high reynolds # indicate

inertial drag(air resistance) is dominant

3
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what does a low reynolds # indicate

viscous drag is more important

4
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air/quadratic Drag equation

½ (Cd→drag coeff→dependent on obj shape)(ro→density)(A→cross sectional area)(v²→velocity)

5
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Viscous Drag

D = (b→constant based on size/shape)(n→viscosity)(v→velocity)

6
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linear drag for sphere

D=6(pi)(n)(r→radius)(v→elocity)