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: 2,068 Thanks: 692 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 

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