Chapter 5145P5.57(a)The crate is in equilibrium, just before it starts tomove. Let the normal force acting on it be nandthe friction force, fs.Resolving vertically:nF Pg=+sinθHorizontally:Pfscos=But,FIG. P5.57fnss≤μi.e.,PFPsgcossin≤+chorgcossin−≤af.Divide by cos:g1tansecaf.ThenPFsminimum=−sectan1.(b)P=()−040010010400.sec.tanNdeg
This is the end of the preview. Sign up
access the rest of the document.
This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .