March 28th, 2014, 04:16 PM  #1 
Newbie Joined: Mar 2014 From: Queensland Posts: 1 Thanks: 0  Equilibrium Or so I think
I am trying to understand this question, I have tried multiple different 'ideas' to get the answer but I keep getting stuck due to the fact that well there is very little data, so somehow I need to get the info but i don't know how. The rightangle uniform slender bar AOB has mass m. If friction at the pivot O is neglected, determine the magnitude of the normal force at A and the magnitude of the pin reaction at O. If someone could please explain this to me. Thanks 
April 16th, 2014, 07:29 AM  #2 
Senior Member Joined: Apr 2014 From: Glasgow Posts: 1,884 Thanks: 610 Math Focus: Physics, mathematical modelling, numerical and computational solutions 
When doing problems such as these, the first step is to always put the forces on the diagram. Remember that although the frictional force at O is neglected, this doesn't mean that the frictional force at A is! Also, think about: i) what kind of forces are acting in the problem (weight? friction?) ii) how all the linear forces add up as a whole (after specifying which direction you want to be positive, all horizontal forces must sum to zero and all vertical forces must sum to zero) iii) how all the moments contribute as a whole After you follow these steps, the problem should be a bit easier. It is probably also safe to assume that the bar has a uniform density and therefore has its mass distributed evenly across the bar. I hope this helps! If you are still stuck, I can provide an answer for you. 
April 21st, 2014, 02:16 AM  #3 
Newbie Joined: Apr 2014 From: Capella Posts: 1 Thanks: 0 Math Focus: Triginometry 
Hi there, Are you able to provide further information to this problem? Maybe an example of a similar question with different values? M 

Tags 
equilibrium 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Equilibrium Points  arron1990  Calculus  4  June 5th, 2012 12:44 AM 
Thermal Equilibrium  rnck  Physics  3  June 15th, 2011 06:55 AM 
Equilibrium  Evil Tomato  Physics  2  December 8th, 2010 02:35 PM 
Equilibrium  Francesco Mureddu  Economics  4  September 27th, 2010 02:49 PM 
Equilibrium  Francesco Mureddu  Calculus  1  August 24th, 2010 05:09 PM 