PPT-Lecture 8: Wind & effects of friction

Inertial Oscillations A fluid parcel is initially at x o y o and pushed with a velocity u o u x t 0 u o v o It is then allowed to move freely on a rotating earth. As the wind increases the body is cooled at faster rate causing the skin temperature to drop Wind Chill does not impact inanimate objects like car radiators and posed water pipes because these objects cannot cool below the actual air temperature Wha Three real forces . (gravity, pressure gradient, and friction) push the air around. Two apparent forces . due to rotation (Coriolis and centrifugal). Large-scale flow is dominated by gravity/pressure and Coriolis … . Cold. Front. Convective precipitation. 50–100 mile wide . band along front . “. Overrunning. ”. Typical. Warm. Front. Clouds and precipitation . precede surface front. Stratiform clouds starting. In-Class Activities. :. Check Homework, if any. Reading Quiz. Applications. . Characteristics of Dry Friction. . Problems Involving Dry Friction. Concept Quiz. Group Problem Solving. Attention Quiz. Upward pressure gradient . force (PGF) . is balanced by . gravity (g).. HYDROSTATIC RELATIONSHIP. Despite very strong vertical pressure gradients, vertical. winds (rising and sinking air) are generally weak.. Three real forces . (gravity, pressure gradient, and friction) push the air around. Two apparent forces . due to rotation (Coriolis and centrifugal). Large-scale flow is dominated by gravity/pressure and Coriolis … . What factors affect (the size of) friction?. Survey says:. Surface texture. Surface material. Surface area. Speed of slide. Mass. Weight. Angle of surface. Normal Force. What is the mathematical relationship between…... What factors affect (the size of) friction?. Survey says:. Surface texture. Surface material. Surface area. Speed of slide. Mass. Weight. Angle of surface. Normal Force. What is the mathematical relationship between…... What is the ultimate energy source for most wind?. Do Now. What is the ultimate energy source for most wind. ?. The Sun. Do Now. Coriolis Effect. Humidity. Isobar. Friction. Key Words. Air Pressure. Barometer. 1. Today’s Concept:. Friction. UP. Midterm . 1. Mechanics Lecture 6, Slide . 2. Average=102.1”%”. . Excellent Job!. You can do the problems!. Unit 5 Homework. Mechanics Lecture 6, Slide . 3. The amount of friction depends on...... Surface Roughness. Forces pushing the two surfaces together.. Types of Friction. https://app.discoveryeducation.com/player/view/assetGuid/72E28A59-0EAB-4EC9-A097-365513460023. Problem 6.11 (a, b). Mark all centers of High and Low pressure (and 2 locations where it might be off the map). Check surrounding isobars . Find 2 troughs and 2 ridges. Trough:. elongated region of low pressure. REVIEW OF KEY FORCES. Pressure gradient force (PGF). High to Low. Perpendicular to the isobars. Proportional to isobar spacing. Coriolis. force (COR). Acts to . right. of parcel direction in N. Hemisphere. Downhill creep is diffusive:. Resitance. to sliding depends on pore pressure:. Angle of repose is . independent. of gravity. Effective friction coefficient of long-. runout. landslides . is very low .