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3.4 Moments (A-level only)

3.4 Moments (A-level only)

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Question 8

A uniform ladder AB AB\,AB has length 5 m and mass 18 kg. It rests with A A\,A on rough horizontal ground and B B\,B against a smooth vertical wall, making an angle of 60∘ 60^\circ\,60∘ with the ground. A painter of mass 70 kg stands 3.5 m from AAA, measured along the ladder. The painter is modelled as a particle.

Figure for question 3

Use g=9.8g=9.8g=9.8 m s−2^{-2}−2 throughout.

a.

By taking moments about AAA, find the magnitude of the contact force exerted by the wall at BBB.

[3]
b.

Find the magnitude of the resultant contact force exerted by the ground on the ladder at AAA.

[2]
Markscheme

3.4 Moments (A-level only) Questions

  1. A Level
  2. /Maths
  3. /3.4 Moments (A-level only)

53 exam-style questions on OCR A Level Maths 3.4 Moments (A-level only), covering 3.4.1 Moment of a force (A-level only), 3.4.2 Equilibrium of a rigid body (A-level only), and 3.4.3 Moments in static contexts (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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