NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/
November 25, 2017, 12:03:41 am *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
 
   Home   Help Search Login Register  
"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"
Google Bookmarks Yahoo My Web MSN Live Netscape Del.icio.us FURL Stumble Upon Delirious Ask FaceBook

Pages: [1]   Go Down
  Print  
Author Topic: cylinder touching wall  (Read 6919 times)
0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
pradeep123
Newbie
*
Offline Offline

Posts: 2

«
Embed this message
on: December 31, 2008, 05:06:14 pm »

a cylinder is on a rough floor with its axis horizontal. it is touching a vertical wall (also rough). a cross sectional plane perpendicular to axis going through center of mass would be a circle with two points touching wall and floor , both have equal roughness of mu. cylinder masss is W. the question is the maximum couple ( around the axis) that the cylinder could withstand  without slipping.

my approach is as follows

1. freebody diagram with , frictional forces on wall and floor and normal forces  + weight  + couple M
2. resolve forces (2 equations)- M has no contributiion
3. taking moments from centre ( M present)
4 two inequalities for F< mu R  for floor and wall

gives 5 equations ,

5. get all quantities using  3 equations taking one frictional force as parameters
6. plug in  that in two inequalities which will give  X>F>Y inequality
7. from that i got X>y which tells me what my M is

I dont seem to get the book answer which is Wg(mu)(mu+1)/(mu^2+1)

have i missed something?
Logged
Fu-Kwun Hwang
Administrator
Hero Member
*****
Offline Offline

Posts: 3080



WWW
«
Embed this message
Reply #1 on: December 31, 2008, 09:48:12 pm »

Could you attach a simple drawing for your system and write down your equations?
Logged
Pages: [1]   Go Up
  Print  
"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"
 
Jump to:  


Related Topics
Subject Started by Replies Views Last post
reflection of a point source wave from a wall
Wave and Fluid
Fu-Kwun Hwang 1 12608 Last post February 02, 2008, 11:30:07 am
by tanghb
Charged Particle and Wall
Examples for beginner who want to learn EJS
Fu-Kwun Hwang 0 7577 Last post January 17, 2009, 01:46:06 pm
by Fu-Kwun Hwang
How can i transform a 3D cylinder using 2 transformation with dynamic variables
Questions related to EJS
lookang 2 6599 Last post November 09, 2009, 08:01:49 pm
by lookang
Reflection of a point source wave from a wall
wave and fluid
ahmedelshfie 0 3818 Last post May 26, 2010, 01:27:56 am
by ahmedelshfie
How to detect that the objects are just touching each other, and set the dv/dt=0
Questions related to EJS
lookang 2 3776 Last post June 29, 2010, 02:44:28 pm
by lookang
Powered by MySQL Powered by PHP Powered by SMF 1.1.13 | SMF © 2006-2011, Simple Machines LLC Valid XHTML 1.0! Valid CSS!
Page created in 0.054 seconds with 22 queries.since 2011/06/15