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Concept of torque direction 
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#1
Apr1812, 03:10 PM

P: 4

Hi, I want to clear my concept about the direction of torque for a sin curve. Assume the torque can be represented by a sin wave (T=sinx, where x is from 0 to 2π and it starts from the origin(0,0) with an amplitude of 1.
My understanding of the torque direction is as follows (assumuing clockwise torqe to be positive): 1 from 0 to the first maxima (0≤T≤1), torque was increasing and its direction was positive. 2 from first maxima, the direciton of the torque becomes anticlockwise until it reashces the first minima. (i.e. for 1≤T≤1 torque is anticlockwise) 3 From the first minima until the zero crossing, the direction of the torque becomes clockwise again.i.e. (1≤T≤1, torque is clockwise again). Please comment if I am right or wrong and suggest me the true direction sense for this particular case. Many thanks for your help! 


#2
Apr1812, 04:28 PM

P: 4,663

First of all, sin(x) is unitless, while torque has units of length x force; e.g., meterNewtons.
Torque is positive; 0 < x < π Torque is negative; π < x < 2π The right hand rule determines direction of torque. 


#3
Apr1812, 05:04 PM

P: 4

Thanks Bob!! Its clear now, really appreciate your help!



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