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1 In the diagram on the right a plank weighing 120N is supported by two...

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Physics

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1 In the diagram on the right a plank weighing 120N is supported by two trestles at points A and B A man weighing 480 N is standing on the plank a Redraw the diagram showing all the forces acting on the plank b Calculate the total clockwise moment of the two weights about A c Use the principle of moments to calculate the upward force from the trestle at B d What is the total downward force on the trestles e What is the upward force from the trestle at A f The man now walks past A towards the left hand end of the plank What is the upward force from the trestle at B at the instant the plank starts to tip g How far is the man from A as the plank tips K 1 m 1 m A weight of man 480 N 2 m centre of mass of plane weight of plank 120 N B

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