Physics Worksheet - Annual Examinations For Secondary Schools, 2015 Page 5
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127. Noel carried out an experiment on moments using a metre ruler.
a) State the two conditions needed for a system to be in equilibrium.
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b) The metre ruler he sets up is shown in Figure 7. It is pivoted at its midpoint but is not balanced.
.
.
.
0
5 m
0
1 m
0
4 m
1N
2N
2N
Figure 7
i) Show (through calculation) that the resultant moment is 0.3 N m.
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ii) State the direction in which the metre ruler turns.__________________________________ [1]
c) A builder needs to move a concrete brick using a wheelbarrow. Figure 8 shows two different
wheelbarrows having the same brick placed in a different position.
wheelbarrow A
wheelbarrow B
Figure 8
i) Explain why the concrete block in wheelbarrow B is not producing a turning effect.
____________________________________________________________________________ [1]
ii) Explain, by making use of the terms moment, force and perpendicular distance, the advantage
of having longer handles as in wheelbarrow B.
_______________________________________________________________________________
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____________________________________________________________________________
[3]
Physics – Form 5 Secondary – Track 2 – 2015
Page 5 of 12
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