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1 markTurning Forces

CSEC Physics · January 2017 · Paper 2 · Question 3(b)(iii)

Figure 2 shows Kyle and Keion balanced on a seesaw. Kyle's weight is 500 N and Keion's weight is 300 N. The seesaw is made of a uniform plank of weight 800 N which is 4 m long, pivoted at its centre.

What is the moment of the reaction force about the pivot?

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Other parts of this question

  1. 3(a)(i)Fill in the blanks in the following passage about the moments of forces. The _______________ of moments states that when a body is in equilibrium the sum of…[4 marks]
  2. 3(a)(ii)Apart from the 'seesaw', identify TWO situations in which a force will result in a turning effect.[2 marks]
  3. 3(b)(i)By taking moments about the pivot, calculate the distance, x, that Keion must sit from the pivot to balance the plank if Kyle sits 1 m from one end of the…[4 marks]
  4. 3(b)(ii)If balanced, calculate the reaction force at the pivot.[4 marks]

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