Q. 19

The vector sum of a system of non-collinear forces acting on a rigid body is given to be non-zero. If the vector sum of all the torques due to the system of forces about a certain point is found to be zero, does this mean that it is necessarily zero about any arbitrary point?

Answer :

No,


The sum of all the torques about the given certain point o is zero.


So,



Now, for any other arbitrary point sum of torques can be written as



In the above expression the second term may or may not vanish.


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