Answers to End-of-chapter questions
8 Deforming solids
1 The graph should have a straight line from
the origin to the point where force = 5 N
and extension = 0.25 m. The y-axis should
be labelled F / N and the x-axis labelled
Extension / m. After the straight-line portion
the graph continues with a positive gradient
but the gradient decreases.
2 Diagram as series arrangement in Figure 8.7 on
page 121 of the Coursebook.
Total extension = 0.20 m
3 a
b
c
d
1.96 × 10−7 m2 ≈ 2.0 × 10−7 m2
39.3 ≈ 39 N
0.050 or 5.0%
4.0 × 109 Pa
4 A crisp biscuit is a brittle material. Being brittle
may be a disadvantage as it will break into many
small pieces. Lead is a ductile material. This is
an advantage as it can be hammered into place
on a roof.
5 a 1.67 × 1011 Pa ≈ 1.7 × 1011 Pa
b 4.0 × 10−3 J
c 3.0 × 10−3 J
AS and A Level Physics © Cambridge University Press
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