Chapter 7 Forces and force balances.docx

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

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern