westkid85

anyone know how to calculate the torque of a square or rectangular solid body??

Pommie

That's like asking how to calculate the speed of a red car.

The answer is "more information required".

Mike.

westkid85

assume a 13cm(length) x 9cm(width) x 9cm(height)
with a mass of 1 Kg
how could the calculate be made?

ericgibbs

hi,
Look up centre of inertia then determine the centre using the formula

and then use the standard torque formula for this centre.

Do you follow this.?

edit:
http://en.wiktionary.org/wiki/centre_of_inertia

http://www.pschweigerphysics.com/rotmot.html

edit:
http://maths.dur.ac.uk/~dma0cvj/math...pplement2.html

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westkid85

hmmm....lets make it this way
For a motor Torque equation
T(motor) = T(Load) + J(dw/dt) + T(friction)

Anyone know how to calculate the T(Load)?
Izzit the same calculation way as Mr.ericgibbs mention above?
By having the information:
assume a 13cm(length) x 9cm(width) x 9cm(height) [Rectangular Solid Body]
with a mass of 1 Kg

Pommie

You have to find the center of the mass and measure how far (horizontally) the center of the mass is from the pivot. If it's 15cm then the torque is 15(cm)*1(kg) = 15kgcm.

Mike.