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Did
you know that the force of wind on a surface depends on the square of
the velocity? So if wind speed doubles, the force quadruples. If speed
triples, the force is nine times greater and so on. Since pressure
equals force divided by area, it also follows a square law.
For a jet hitting a surface (doesn't matter what the jet is made of: air, water etc), the force of the jet in newtons is:
F = ρAv²
where ρ is the density of the fluid in kg/m³
A is the cross-sectional area of the jet in m²
and v is the velocity in m/s
The higher the velocity of the fluid, the greater the force. (Think of your pressure washer jet hitting a surface).
What's a "newton"?
It's the SI (Système International d'Unités)
unit of force. A force of 1 newton (1 N) will give a mass of 1 kg an
acceleration of 1 m/s². (i.e. the velocity of the mass increases by 1
m/s every second).
More information about the subject in this Stack Exchange discussion.
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