1. Air Pressure, Forces, and Motion Meteorology 101 Dr. Robert M MacKay

2. Newtons Laws of Motion Newtons 3 laws of motion 1. Law of inertia 2. Net Force = mass x acceleration ( F = M A ) 3. Action Reaction

3. 1st Law (Law of Inertia) Every object continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it. acceleration = 0.0 unless the objected is acted on by an unbalanced force

4. 1st Law Inertia (The intrinsic tendency of an object to resist changes in motion) Mass is a measure of an objects inertia Mass is also a measure of the amount of an objects matter content. (i.e. protons, neutrons, and electrons)

5. Newtons 2nd Law Net Force = Mass x Acceleration F = M A

6. Newtons Law of Action Reaction (3rd Law) You can not touch without being touched For every action force there is and equal and oppositely directed reaction force

7. Velocity : Designates speed (how fast) and direction Example: 50 mi/hr North Acceleration: How fast the velocity changes Example: zero to 60 in 6 seconds A=10 mi/hr/sec

8. Is it possible to accelerate while traveling at a constant speed?

12. Forces that influence the wind 1. Pressure Gradient Force 2. Coriolis Force 3. Friction On average Gravity nearly balances the vertical Pressure gradient (hydrostatic balance)

13. Fig. 8-16, p. 203

14. Pressure Gradient=P/dist

15. Pressure Gradient

18. Centrifugal force an (Apparent Force)

20. Coriolis Force (apparent force due to Earths rotation)

21. Coriolis Force Deflects air to right in NH & Left in SH Is always zero at the equator Increases with latitude Increases with wind speed Increases as planet rotation speed increase

22. Coriolis Force

24. Geostrophic Winds

26. Gradient Flow