O-LevelPhysicsForces5054/11 · May/June 2011 · Q81 Mark

A uniform beam is balanced at its midpoint. An object is placed on the beam, as shown. Which force will rebalance the beam?

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A30 N acting upwards, 60 cm to the left of the midpoint

B30 N acting upwards, 60 cm to the right of the midpoint

C45 N acting downwards, 45 cm to the right of the midpoint

D90 N acting downwards, 20 cm to the left of the midpoint

✓ Correct answer

A: 30 N acting upwards, 60 cm to the left of the midpoint

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