Question

ii) State principle of moment​

Answer 1

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PRINCIPLE OF MOMENTS:-

If algebraic sum of moments of all the forces acting on the body about the axis of rotation is zero, the body is in equilibrium. 

According to the principle of moments, in equilibrium:

Sum of anticlockwise Moments = Sum of clockwise moments

EXAMPLE:-

When slightly different weights are placed on the two pans of a beam balance, the beam comes to rest at an angle with the horizontal. The beam is supported at a fixed single point by a pivot. The net torque about this fixed single point due to the two weights is nonzero at the equilibrium position. The whole system does not continue to rotate about the fixed point because the moment is balanced.

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Answer 2

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PRINCIPLE OF MOMENTS:-

If algebraic sum of moments of all the forces acting on the body about the axis of rotation is zero, the body is in equilibrium.

According to the principle of moments, in equilibrium:

Sum of anticlockwise Moments = Sum of clockwise moments

EXAMPLE:-

When slightly different weights are placed on the two pans of a beam balance, the beam comes to rest at an angle with the horizontal. The beam is supported at a fixed single point by a pivot. The net torque about this fixed single point due to the two weights is nonzero at the equilibrium position. The whole system does not continue to rotate about the fixed point because the moment is balanced.