Question

States that the principle of moments

Answer 1

Answer:sum of anticlockwise moments = sum of clockwise moments

Explanation:

Answer 2

Principal of Moments:-

_________________________________

SUM OF THE ANTICLOCKWISE MOMENTS=SUM OF THE CLOCKWISE MOMENTS

____________________________________

Explanation:-

When several force acting on a pivoted body,the tends to rotate it about an axis passing through the pivot.The result moment of all the force on the pivoted point can be found taking the algebraic sum of the movement of each force about the point.

Question arises how to find the algebraic sum?

we have to take

• The anti-clockwise moment is taken as positive.
• The clockwise movement is taken as negative.

_________________________________________

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

_______________________________________

Verification of the principal of movements

(there is a picture follow it for verification)

• Suspended a metre rule horizontally from the fixed support of strong thread at point O.
• Now we will suspend 2 springs balances A and B on either side of scale.
• Now suspend some slotted weights W1 and W2 on the spring balances .
• Now adjust either the slotted weight on the spring balances or the position of spring balance on either side of the thread.

1. Let Distance OB=l2
2. Let weight A = w1
3. Let weight B=w2

Observation:-

The weight w1 tends to turn the meter rule clockwise, while the weight w2 tends to turn the rule anti-clockwise.

_____________________________________

CLOCKWISE MOMENT

• O=W1 * L1

ANTI-CLOCKWISE MOMENT

• O=w2 * L2

_____________________________________

W1 L1 = W2 L2

I.e., clockwise moment= anti-clockwise moment