Physics Half Early Exam - Maria Regina College, Mosta Secondary School Zokrija, 2012/2013 Page 5
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105.
This question is about the centre of gravity.
a) The centre of gravity of an object is the point where the ______________ of an
object seems to act.
[1]
b) Circle ONE of the letters P, Q or R showing the correct position of the centre of
gravity of each object:
P Q R
P
Q
R
(i)
(ii)
guitar
mirror
P Q R
(iii)
(iv)
P Q R
[4]
hammer
plate
clamped
c)
Figure 2 shows the apparatus used
A
nail
to find the centre of gravity of an
irregular
C
irregular flat shape. List in order
flat
shape
Figure 1
(e.g. 1, 2, 3 and 4) the steps to find
B
string with
the centre of gravity of the irregular
mass
flat shape. The first one is done for
you.
stand
Figure 2
This is repeated for holes B and C.
•
Three holes A, B and C are punched in the flat
•
1
shape.
A string with a mass is suspended from the nail
•
and its position is noted.
The shape is suspended freely from hole A using a
•
[3]
clamped nail.
Page 5 of 10
Physics Half yearly exam 2013 – Track 3 - Form 3
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