anonymous
  • anonymous
torque and moment i am really confused b/w these 2 help me out here guyz . another thing when to use which method for direction ? 1. right hand screw rule 2. vector cross product rule it turns out apply both the direction will not be same why ?(ref. a simple beam and a point load acting on transverse plane)
MIT 8.01 Physics I Classical Mechanics, Fall 1999
katieb
  • katieb
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anonymous
  • anonymous
both 'torque' & 'moment of force' mean the same thing. As for the second question, all these rules are equivalent---meaning that , regardless of which rule you use, you will get the same direction. It's just a matter of choice, really.
anonymous
  • anonymous
Any questions?
anonymous
  • anonymous
for simply supported beam a point load is acting then how do u calculate direction n which method

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anonymous
  • anonymous
by vector cross product rule we have force in -j n distance +i resultant cross product will give k direction means beam will tend to rotate in k hows that possible ?
anonymous
  • anonymous
|dw:1343126765977:dw| So what is your doubt?
anonymous
  • anonymous
yes thats right moment will act in k direction n tend to rotate in same but in actual when u apply point load on beam it will tries to rotate in xy plane
anonymous
  • anonymous
|dw:1343127230930:dw|
anonymous
  • anonymous
|dw:1343127366588:dw|
anonymous
  • anonymous
Now, I get it. You think that if the direction of the torque is in the k direction, then it has to rotate in that direction. Am I right?
anonymous
  • anonymous
yes exactly
anonymous
  • anonymous
That is where you are mistaken. This needs a long explanation. Can you wait for about 20 minutes while I write & explain to you what the direction of torque means- in paper & upload it?
anonymous
  • anonymous
thanks for ur help i appreciate it yes why wouldnt i wait
anonymous
  • anonymous
i will wait thanks in advance
anonymous
  • anonymous
are you in some kind of a hurry? I ask this because paper just won't do. You cannot explain directions in 3D with them. So I thought I'd make a short video to explain it. It may take me 2 hrs to upload it.
anonymous
  • anonymous
so is that a yes?
anonymous
  • anonymous
no i am not in any hurry
anonymous
  • anonymous
Great. I'll get to work, then. :) I'll post a link here ASAP okay?
anonymous
  • anonymous
yeah ok
anonymous
  • anonymous
@rajath dont worry i got the answer to that, see the direction which comes out to be k is direction of normal vector or u can say that axis about which it will rotate its not the sense of rotation
anonymous
  • anonymous
that's absolutely right, @akhil009, congrats!! :)

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