Crib sheet
Nomenclature
a = acceleration of object falling in a vacuum, (m/s2) af = acceleration of object falling in a fluid, (m/s2) A = characteristic area for the object, (m2) d = diameter of sphere, (m) Cd = dimensionless drag coefficient Fd = drag force, (N) Fp = drag force on deployed parachute, (N) Fs = drag force on skydiver without a parachute, (N) g = gravitational acceleration, (m/s2) k = drag coefficient, (Ns2/m2) m = mass of object, (kg) R = Reynolds number, t = time, (s) v = velocity of object falling in a vacuum, (m/s) vf = velocity of object falling in a fluid, (m/s) vr = relative velocity between fluid and object, (m/s) Vt = terminal velocity, (m/s) Subscripts
f = refers to fluid p = refers to parachute Greek Symbols
pf = fluid density, (kg/m3) uf = fluid viscosity, (Ns/m2) Equations
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