Form 3 Physics - Boys'' Secondary Mosta Half-Yearly Examinations - Kullegg Maria Regina, 2012 Page 7

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7.
This question is about turning forces
a) State the law of moments.
________________________________________________________________
________________________________________________________________ [2]
b) Figure 4 shows a uniform rod being balanced by a box as shown.
rod
box
0.3 m
1.2 m
pivot
15 N
Figure 4
(i) Label on the diagram in Figure 4, the weight of the uniform rod.
[1]
(ii) What is the point where the weight of the rod seems to act called?
__________________________________________________________ [2]
(iii) Calculate the anti-clockwise moment.
__________________________________________________________ [2]
(iv) What is the value of the clockwise moment?
__________________________________________________________ [1]
(v) Calculate the distance between the centre of the rod and the pivot.
__________________________________________________________ [2]
(vi) Calculate the weight of the rod in N.
__________________________________________________________
__________________________________________________________ [2]
(vii) Calculate the mass of the rod in kg.
__________________________________________________________ [1]
(viii) What would happen to the rod if the box is moved closer to the pivot?
__________________________________________________________
__________________________________________________________ [2]
Page 7 of 8
Physics Half yearly exam 2012 – Track 3 - Form 3

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