Drag Force in a Medium

FD = Drag Force. SI: N
CD = Drag Coefficient. SI: Dimensionless (Typical Values)
A = Coss-sectional Area perpendicular to the flow. SI: m2
r = Density of the medium. SI: kg/m3
v = Velocity of the body relative to the medium. SI: m/s

Re = Reynolds number. SI: Dimensionless
L = Characteristic length of the body along the direction of flow. SI: m
h = Dynamic Viscosity of the medium. SI: N s/m2
r = Density of the medium. SI: kg/m3
v = Velocity of the body relative to the medium. SI: m/s


Air Resistance on a Projectile
The effects of both air resistance and gravity on a ball projected in to the air can be investegated. A drag constant can be varied to change the amount of air resistance. When the air resistance is large enough the ball will approach a terminal velocity quickly.


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