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CAIE IGCSE Physics Core Moments with One Force Each Side

Practise balancing one force on each side of a pivot by equating clockwise and anticlockwise moments and solving for an unknown force or distance.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • calculate each force × perpendicular distance and assign its clockwise or anticlockwise sense
  • equate the opposing moments for equilibrium and rearrange to find the unknown force or distance

1.5.2.3—Apply the principle of moments to question 1

[Maximum number: 3]

Fig. 7.1 shows a barrier at the entrance to a car park. The wooden barrier arm has a weight of 60 N which acts through the centre of gravity at the position shown on Fig. 7.1.

Fig. 7.1

Fig. 7.1

Initially the wooden barrier arm is horizontal.

The wooden barrier arm is in equilibrium. The mass of the soft iron bar A is 23 kg .

Calculate the distance d between the pivot and the joint holding the soft iron bar A .
distance d =

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