1 In the diagram on the right, a plank weighing 120 N 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.
1 In the diagram on the right, a plank weighing 120 N 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.
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Transcribed Image Text:1 In the diagram on the right, a plank weighing 120 N 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
Im 1m
-2 m
centre of
mass
of plane
the trestle at B.
d What is the total downward force on the trestles?
weight
weight
of plank
of man
= 480 N 12G120 N
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?
2 in Testing the principle of moments on the opposite page, moments were taken about X. Calculate the moments
again, only about point Y. Are the sums of the clockwise and anticlockwise moments still equal?
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