QQuestion
The diagram shows wheel O pivoted at point A. Three equal forces F1, F2 and F3 act at point B on the wheel.
(a) Which force will produce maximum moment about A?
(b) Give a reason for your answer in (a).
ICSEClass 10PhysicsForce02 Mark2023 Easy
✓Answer
(a) Force F1 produces the maximum moment.
(b) Moment of force = force × perpendicular distance from the point of application of the force to the pivot point.
Since the three forces are equal, the moment depends on the perpendicular distance.
The perpendicular distance from the line of action of F1 to A equals the diameter of the wheel and is greater than for F2 and F3.
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