Q. 95.0( 2 Votes )

If several forces act on a particle, the total torque on the particle may be obtained by first finding the resultant force and then taking torque of this resultant. Prove this. Is this result valid for the forces acting on different particles of a body in such a way that their lines of action intersect at a common point?

Answer :

Let us assume there are n number of forces acting on H. so, the torque will be




Hence, the statement is proved.


This statement is valid till there exists a common point of intersection.



Let us assume there exists n number of forces having a common point of intersection P. The forces Are applied at particles A, B, C… We are going to find the torque about the point O.



In the diagram A is connected by R1. Using vector summation we can write



So, for the ith particle



Torque,




But



as the angle between them is π.


So,





Hence, the statement is valid till it has a common point of intersection.


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