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3.4 S: Moments (A-level only)

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Question 25

In this question use g=9.8g = 9.8g=9.8 m s−2^{-2}−2.

A uniform plank AB AB\,AB of length 6 m and mass 30 kg rests horizontally on two supports at C C\,C and DDD, where AC=1AC = 1AC=1 m and AD=4AD = 4AD=4 m.

A block of mass m m\,m kg is placed on the plank at BBB, and the plank is then on the point of tilting about DDD.

Figure for question 7

a.

Explain why the reaction of the support on the plank at C C\,C is zero.

[1]
b.

Find the value of mmm.

[3]
c.

Find the magnitude of the reaction of the support on the plank at DDD.

[1]
Markscheme

3.4 S: Moments (A-level only) Questions

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

53 exam-style questions on AQA A Level Maths 3.4 S: Moments (A-level only), covering 3.4.1 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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