Maths - Moments

State how you have used the modelling assumption that:

i the plank is uniform

ii the plank is a rod iii the man is a particle.

i Assuming the plank is uniform means the weight of the plank acts at its centre of mass: i.e.

halfway along the plank.

ii Assuming the plank is a rod means its width can be ignored.

iii Assuming the man is a particle means all his weight acts at the point at which he stands.

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2

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4

4