Physics Worksheet - Annual Examinations For Secondary Schools, 2013 Page 6
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10SECTION B: Answer ALL questions. This section has a total of 45 marks.
6.(a) Jeffrey hangs different weights at the end of a spring. Each time he measures the length
of the spring. The results are shown below.
Weight (N)
0
1
2
3
4
5
6
7
Length (mm)
40
48
60
64
72
80
88
96
Extension (mm)
0
8
(i)
Complete the above table by filling in the missing values.
(3)
(ii)
What is the original length of the spring ? _____________ (1)
(iii) Plot a graph of Extension (mm) on the y-axis against Weight (N) on the x-axis. Draw
the best straight line through your points.
(5)
(iv) Jeffrey reads one of the lengths incorrectly. Which one is it ?
_________
(1)
(b)
The same spring is now attached to a block resting on a rough surface, as shown below.
(i)
As the pulling force is increased, the block just starts to move to the right when the
spring is 68 mm long. What is the extension of the spring when it is 68 mm long ?
__________________________________________________________________________
(1)
(ii)
The same spring is now used to pull a much heavier block. The spring becomes
permanently deformed. Explain.
___________________________________________________________________________
___________________________________________________________________________
(2)
(iii) Name two ways in which this frictional force can be reduced.
___________________________________________________________________________
___________________________________________________________________________
(2)
Physics – Secondary Schools – Track 3 – Form 3 – 2013
Page 6 of 10
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