Physics Annual Examination Worksheet '- Educational Assessment Unit, 2014 Page 6
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10SECTION B
Each question carries 15 marks. This section carries 45 marks of the total marks for this paper.
6. This question is about moments.
a) What is meant by the moment of a force?
________________________________________________________________________ [1]
force
Figure 7
sensor
block
data logger
stand
pivot
b) Amy sets up a metre rule of negligible weight such that it is pivoted at one end and is kept
horizontally by the pull of a force sensor attached at the other end (Figure 7). She moves the
block towards the force sensor and records the force exerted by the force sensor to keep the
ruler horizontal. The data she obtains is given in the table below.
Distance of mass from pivot (cm)
10
20
30
40
50
60
70
Force measured by force sensor (N)
2.5
5.0
6.8
10.0
12.5
15.0
17.5
i) Plot a graph of Force (N) on the y-axis against Distance (cm) on the x-axis.
[5]
ii) One of her readings is incorrect. Circle on your graph the reading that is incorrect.
[1]
iii) The correct value should have been ________ N.
[1]
iv) Given that the weight of the block is 25 N, calculate the clockwise moment when it is placed
40 cm away from the pivot.
_____________________________________________________________________ [1]
v) State the value of the anti-clockwise moment. Give a reason for your answer.
_______________________________________________________________________
_____________________________________________________________________ [2]
c) Alex is practising windsurfing as in Figure 8. Suddenly the wind
force increases and he leans backwards to balance his windsurf.
Wind force
i) Calculate the moment produced by the wind force.
180 N
________________________________________________[1]
ii) What is the moment caused by Alex if he balances his windsurf?
1.6 m
_____________________________________________[1]
iii) Find the value of the distance ‘d’.
pivot
d
600 N
__________________________________________________
Figure 8
_________________________________________________________________________ [2]
Physics – Form 3 Secondary – Track 3 – 2014
Page 6 of 10
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