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Physics · May / June 2016 · Paper 12 · Question 6

5054Turning effect of forces

A uniform plank is pivoted at its mid-point. Two weights are added to the plank, one weight on each side of the pivot in the positions shown. A vertical force is applied at point X to balance the plank. What is the size and direction of this force?

  1. Asize / N: 2.0; direction: downwards
  2. Bsize / N: 2.0; direction: upwards
  3. Csize / N: 4.0; direction: downwards
  4. Dsize / N: 4.0; direction: upwards

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Correct answer: B. size / N: 2.0; direction: upwards

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