Static Equilibrium

  • #1
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Homework Statement


I have a question about the following question:

upload_2014-12-15_20-2-23.png


Firstly, shouldn't there be a normal force for each hand (part a), but here they treat it as one normal force.

Also in part b, why isn't the torque for Fn1h = 0? Since that is the pivot point, isn't the moment arm zero?
 

Answers and Replies

  • #2
Simon Bridge
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Firstly, shouldn't there be a normal force for each hand (part a), but here they treat it as one normal force.
How is the result different if you give each hand a separate normal force?

Also in part b, why isn't the torque for Fn1h = 0? Since that is the pivot point, isn't the moment arm zero?
##F_{N1} \neq 0## and ##h\neq 0## therefore ##F_{N1}h \neq 0## ... take a closer look: what are they using for the pivot point in that calculation?
 
  • #3
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Wow. The pivot point is the location of the foot and N1 is for the hands. I see. Thank you.
 
  • #4
Simon Bridge
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Well done. Remember all those horizontal mean static problems - beam between two supports?
Remember how you'd do a sum-of-torques for each support as the pivot?
 
  • #5
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I actually don't know what you're referring to as I am learning torque and rotational dynamics on my own (on my final exam tomorrow and my teacher rushed everything on rotation ) - I don't think I've come across a problem like that
 

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