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Four metal bars A, B, C and D are hung from a rod as shown
below. The north pole of a bar magnet is brought near X, and then
Y, of each metal bar.
The table below shows the observations made during
North Pole and X
North Pole and Y
(a) Which of the metal bars are magnets?
(b) Explain your choice in (a).
(c) Which one of the metal bars is not a magnet but made of
Sue conducted several test on materials, A, B, C and D, and
tabulated her results below.
ability to stretch
(a) What material could Sue use to make a swimming cap which can
keep her hair dry?
(b) Could Sue give a toy made of material A to a baby?
(c) Give a reason for your answer in (b).
rubber ball mineral water milk
water vapour bottle
Study the things listed in the box above. Classify them in the
No definite shape
The "pulling" distance of a magnet is the furthest distance from
which it is able to attract a magnetic object. Elaine carried out
an investigation to find out the "pulling" distance of 3 different
types of magnets.
She recorded the "pulling" distance of the different magnets in
the table below.
"Pulling" Distance (cm)
(a) List the magnets according to their strengths, from the
weakest to the strongest. 
(b) State the relationship between the strength of
the magnetic force and the pulling distance of the magnets. 
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