# NTNUJAVA Virtual Physics LaboratoryEnjoy the fun of physics with simulations! Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/

## Information about this web site => Question related to Physics or physics related simulation => Topic started by: pradeep123 on December 31, 2008, 05:06:14 pm

 Title: cylinder touching wall Post by: pradeep123 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 follows1. freebody diagram with , frictional forces on wall and floor and normal forces  + weight  + couple M2. resolve forces (2 equations)- M has no contributiion3. taking moments from centre ( M present)4 two inequalities for F< mu R  for floor and wallgives 5 equations , 5. get all quantities using  3 equations taking one frictional force as parameters6. 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 isI dont seem to get the book answer which is Wg(mu)(mu+1)/(mu^2+1)have i missed something? Title: Re: cylinder touching wall Post by: Fu-Kwun Hwang on December 31, 2008, 09:48:12 pm Could you attach a simple drawing for your system and write down your equations?