Annual Examinations For Secondary Schools 2015 (Physics) Worksheets - Department For Curriculum Management Page 3
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12b) Elisa and Matthew find that an egg sinks in fresh water but floats in salty water.
(The density of fresh water is 1 g/cm
3
)
i) Explain why this happens.
__________________________________________________________________________
________________________________________________________________________[1]
ii) Suggest a value for the average density of an egg.
__________________________________________________________________________
________________________________________________________________________[1]
2. In an experiment to prove Hooke’s Law, Maria and Gabriel found the following results:
Force (N)
0
1
2
3
4
Length of Spring (mm)
40
49
58
Extension (mm)
0
9
27
36
a) Fill in the missing values.
[3]
b) What is the original length of the spring? _____mm
[1]
c) What can you say about the relationship between force and extension?
________________________________________________________________________[1]
d) What type of graph will Maria and Gabriel obtain if they had to plot a graph of extension
against force using the measurements in the table?
________________________________________________________________________[1]
e) Gabriel decides to load the spring with much heavier weights. What do you think will
happen? Explain.
__________________________________________________________________________
________________________________________________________________________[2]
Physics – Form 3 Secondary – Track 2 – 2015
Page 3 of 12
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