the force

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If the force increases at least as the square of the wind speed, high-wind conditions will produce effects far more important than their frequency of occurrence would suggest, as five hours of 60-knot storm winds will put more momentum into the water than a week of 10-knot breezes. If it should be shown that, for high winds, the force on the surface increases even more than the square of the wind speed, then the transfer of momentum to the ocean will turn out to be dominated by the occasional storm rather than by the long-term average winds.

Would you possibly tell me what the force is here means?-at the beginning of the sentence.which force?

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