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4 marksTurning Forces

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

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.

Calculate the weight of the plank, W.

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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)(iii)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.[3 marks]

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