PRINCIPLE OF MOMENTS
TORQUE = FORCE × DISTANCE
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The See-Saw
4
3
2
1
1
2
3
4
40 N
30 N
anticlockwise moment
clockwise moment
30 N distance
1. Moment of Force (Torque)
τ = F × d
d = perpendicular distance from the pivot
unit: newton metre (N m)
2. Principle of Moments
Balance: sum of clockwise moments = sum of anticlockwise moments
40 × 1.5 = 60
3. Remember
A door handle is fixed far from the hinge
A long spanner → less force needed
MATRIC PHYSICS · TURNING EFFECT · PUNJAB BOARDS
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