Go to Post Typed in "WaTeRgAmE" for the password and unfortunately it wasn't it. Bummer. - Kuhnahtt [more]
Home
Go Back   Chief Delphi > Technical > Technical Discussion
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #25   Spotlight this post!  
Unread 09-08-2002, 09:10
Paul Copioli's Avatar Unsung FIRST Hero Woodie Flowers Award
Paul Copioli Paul Copioli is offline
President, VEX Robotics, Inc.
FRC #3310 (Black Hawk Robotics)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 2000
Location: Rockwall, TX
Posts: 1,393
Paul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond reputePaul Copioli has a reputation beyond repute
Mu can be infinite (in theory)

The quantitative (testing) way to determine Mu is by putting the material you want to test on an inclined surface you wnt to test it against. In our csae, this is the carpet. Keep lifting the incline until your material starts to slip. You can calculate Mu by taking the tangent of the angle from horizontal. Mu = tan(theta).

Note that the tan(90deg) = infinite. Note that it does not depend on the weight. Only the frictional force depends on weight Ff=Fn*Mu. Here is the derivation:

(1) Definitions:
Mu = coeficient of static friction
W = weight of material (block, for example)
Theta = Angle above horizontal
Fn = Force Normal to the incline
Ff = Frictional force parallel to the incline

(2) Ff = Fn*Mu (definition for Mu)
(3) From geometry sin(Theta)=Ff/W & cos(Theta)=Fn/W
(4) Substitute (2) for Ff and Sin(Theta)=Fn*Mu/W
(5) tan(Theta) is defined as sin(Theta)/cos(Theta) so:

Tan(Theta) = (Fn*Mu/W) / (Fn/W)

(6) Simplify and cancel terms ... Tan(Theta) = Mu

-Paul
 


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
traction questions AlbertW Rules/Strategy 2 05-01-2003 17:58
Results of traction test IBApril180 Technical Discussion 3 04-01-2003 18:56
Power, speed, and torque... AGH Gui Cavalcanti Technical Discussion 5 10-11-2002 19:02
Gear Woes Simon G Technical Discussion 14 24-01-2002 16:31
Traction Limited, rather than torque Simon G Technical Discussion 6 23-01-2002 07:08


All times are GMT -5. The time now is 16:58.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi