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3 marksTurning Forces

CSEC Physics · January 2014 · Paper 2 · Question 2(b)(iii)

Patrick and Patricia showed their class a 'magical' balancing act. They both sat on one side of a uniform 6.0 m plank. Patrick sat 1.0 m from the pivot located 0.5 m from the centre of the plank. Patricia sat 0.5 m from the pivot, on the same side as Patrick. Figure 2 shows the 'magical' balancing act. X represents the pivot point.

If Patrick sat alone on the plank, calculate where he would have to sit in order to maintain his 'magical' balancing act. The pivot remains as before.

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Other parts of this question

  1. 2(a)(i)Figure 1 shows some physical quantities and their units. Draw an arrow from EACH quantity to its unit.[3 marks]
  2. 2(a)(ii)Complete Table 2 to show the names of three forces and a situation in which EACH force acts.[4 marks]
  3. 2(b)(i)Label, as W, the point on Figure 2 where the weight of the plank acts.[1 mark]
  4. 2(b)(ii)Calculate the weight of the plank, W.[4 marks]

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