Physics Secondary Schools Worksheet Page 4
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104.(a) A student holds a ruler at one end and slides a weight along the ruler.
(i)
What is meant by the moment of a force ?
__________________________________________________________________________
(1)
(ii)
At which point A , B or C will the turning effect of the weight feel greatest? Explain.
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__________________________________________________________________________
(2)
(iii) In which direction will the moment of the weight act?
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(1)
(b)
The diagram shows a mobile crane. The crane driver finds that
a load of 10 000 N would be safe at a distance, d , of 6.0 m.
(i)
Calculate moment produced by this force.
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_______________________________________________
(2)
load
(ii)
What might happen if a very large load is lifted by the crane ? Explain.
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(2)
Physics – Secondary Schools – Track 2 – Form 3 – 2013
Page 4 of 10
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