Chapter 7 Forces and force balances.docx

# Chapter 7 Forces and force balances.docx - Chapter 7 Forces...

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Chapter 7 Forces and force balances I. Why does air move, and what controls the speed and direction of its movement? A. Pressure gradience, gravitational force, frictional force, and Coriolis force. II. Pressure gradient force: A. Molecules in random thermal mothing strike the wall on both sides, imparting momentum to the wall with each collision. Air molecules are on the left side of the wall than on the right, with each molecule, on average, imparting the same energy per collision to the wall. 1. By unit area, an area with a dimension of one unit. B. The wall moves in response to the difference in pressure between its left and right sides. The difference in air pressure can result from a difference in air pressure can result from a difference in air density (more molecules), air temperature (more energy per collision), or both. C. On a larger scale, if the pressure is higher on the left than on the right, each of the molecules in the air will accelerate to the right, and the wind, which is average motion of all the molecules, will be left to right. The rate at which the air will accelerate depends on the rate at which pressure changed with distance. D. The force applied to a small parcel of air due to pressure differences is called pressure gradient force.

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• Spring '15

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