Calculating Torque?

  • Thread starter mawais15
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Calculating Torque??

i wonder how would i calculate the amount of torque required to give a rectangular piece of marble, an angular velocity of pi radians/second given the angular moment of inertia of that slab.

The bearing supports holds a coefficient of friction of 0.2 and the shaft diameter is 20mm. the angular moment of inertia of the slab about the rotation axis is 200 kg-m2. The distance between supports is 1 meter and the slab is in the center of the shaft.

Regards
 

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  • #2
tiny-tim
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hi mawais15! :smile:
i wonder how would i calculate the amount of torque required to give a rectangular piece of marble, an angular velocity of pi radians/second given the angular moment of inertia of that slab.
torque gives you angular acceleration (τ = Iα), not angular velocity …

once you find the angular acceleration, you can get the angular velocity using the standard constant acceleration equations :wink:
 
  • #3
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hi mawais15! :smile:


torque gives you angular acceleration (τ = Iα), not angular velocity …

once you find the angular acceleration, you can get the angular velocity using the standard constant acceleration equations :wink:
how about incorporating the bearing friction to maintain the desired angular velocity?
 
  • #4
tiny-tim
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the friction with the bearings is a torque also, so you just subtract it from the applied torque
 
  • #5
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but i the question is that how much torque do i have to apply..
 

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