Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2013 Page 3
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b.
The density of water is 1 g/cm
.
i.
Name one material from Table 1 which floats on water.
____________________
(1)
ii.
Give a reason for your answer.
___________________________________________________________________________
(1)
c.
Joseph has another iron block, marked L, larger than that of
S
Matthew’s, marked S.
L
iron
Tick ( √ ) one box with the correct answer.
i.
iron
The density of the larger iron block L is:
3
3
3
greater than 7.9 g/cm
smaller than 7.9 g/cm
equal to 7.9 g/cm
(1)
ii.
Explain your answer.
___________________________________________________________________________
(2)
3.
The figure below represents Nadine and John sitting on a uniform see-saw AB. The weight of
the see-saw is 300 N and the pivot is at the centre of the see-saw. Nadine weighs 400 N.
A
P
B
0.5 m
0.7 m
1 m
m
m
Nadine
John
a.
Find the:
i.
distance between John and the pivot P,
___________________
(2)
ii.
direction of Nadine’s turning effect about the pivot P.
___________________
(1)
b.
On the above figure mark the position of weight of the see-saw AB by means of an arrow.
(1)
c.
Calculate:
i.
the size of Nadine’s moment about the pivot,
___________________________________________________________________________
(2)
ii.
John’s weight assuming that the see-saw is perfectly horizontal (in equilibrium),
___________________________________________________________________________
___________________________________________________________________________
(2)
iii.
the total weight supported by the pivot.
___________________________________________________________________________
(2)
Physics – Secondary Schools – Track 2 - Form 5 – 2013
Page 3 of 12
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