Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2014 Page 10

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12. Bart and Lisa have a uniform ruler. They want to find its weight P without using a balance.
Their measurements are listed in a table as shown:
1.0 m
0.2 m
d
Uniform
ruler
P
W
0.5
1.0
1.5
2.0
2.5
Load W (N)
2
4
6
8
10
1/d (1/m)
a) The weight P of the uniform ruler acts at its _____________________________________[2]
b) At what distance is the weight P of the ruler acting?
________________________________________________________________________[2]
c) On the graph paper plot a graph of load W on the y-axis against 1/d on the x-axis.
[6]
d) What is the relationship between the load W and 1/d?
________________________________________________________________________[2]
e) State the principle of moments.
__________________________________________________________________________
________________________________________________________________________[2]
f) Calculate the weight P of the ruler given that the clockwise moment is 0.25 N m.
__________________________________________________________________________
________________________________________________________________________[2]
g) Draw the reaction force acting at the pivot.
[2]
h) Calculate the reaction at the pivot when the load W is 3 N.
__________________________________________________________________________
________________________________________________________________________[2]
Physics – Secondary Schools - Track 2 – Form 5 – 2014
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