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4.2.1 Moments (A-level only)

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Question 14

A uniform plank AB AB\,AB has length 5 m and mass 8 kg. The plank rests horizontally on two supports M M\,M and NNN, where AM=0.5AM = 0.5AM=0.5 m and AN=4AN = 4AN=4 m.

a.

Find the magnitude of the reactions of the support at M M\,M and NNN.

[3]
b.

A block is now placed at B B\,B and the plank is on the point of tilting about NNN. Find the weight of the block.

[3]
c.

Find the magnitude of the reaction at NNN.

[2]

4.2.1 Moments (A-level only) Questions

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