a explain that an object travelling in a fluid experiences a resistive or a frictional force known as drag b state the factors that affect the magnitude of the drag force c determine the acceleration of an object in the presence of drag ID: 776500
Download Presentation The PPT/PDF document " Drag Learning Objectives" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Drag
Slide2Learning Objectives
(a) explain that an object travelling in a fluid experiences a resistive or a frictional force known as drag;
(b) state the factors that affect the magnitude of the drag force;
(c) determine the acceleration of an object in the presence of drag;
Slide3Drag
Drag is a resistive forceIt depends on: velocitycross-sectional areaShapeRoughness of surfaceIt also is affected by the density of a gas or viscosity of a liquid
Slide4To calculate Drag
F = 1/2 ρCdAv2Where F = drag force ρ = densityCd = coefficient of dragV = velocity
Slide5We will take
ρ
as = 1.29kgm
-3
For a rough sphere Cd = 0.48
For a flat plate = 1.28