Centre of Gravity and Stabilty
Centre of gravity
Try to balance a cardboard on your
figure tip.What do we observe. We observe there isonly one point which the
cardboard is balanced. The point which the cardboard is balanced is called the
cenre of gravity of the cardboard.
Centre of gravity: The centre of gravity of an object
is the point through which the entire weight of the object appears to act.
How to we find the centre of gravity
of a object ?
Centre of gravity for Regular – shaped objects
Generally the centre of gravity of
the geometrical shaped object lie on the geometric centre of the object.
Examples of centre of gravity for
Regular-shaped objects. 1. Weight of Card, 2. Weight of Triangle, 3. Weight of
Disc, 4. Weight of Ring.
What about irregular shaped objects ?
Apparatus : Irregularly shaped card,
string, pendulum bob, stand
1. Make three holes in the lamina.
2. Suspend the lamina from the
optical pin through one of the holes as shown.
3. Suspend the plumbline from the
pin and mark the position of the plumbline on the lamina.
4. Draw lines on the lamina
representing the positions of the plumbline.
5. Repeat the above steps for the
holes.
6. Label the intersection of the
three lines as X, the position of the centre of gravity of the lamina.
Meter Rule
The ruler is in equilibrium when
supported at its centre of gravity.
For a regular object such as a
uniform meter rule , the centre of gravity is at the centre of the object. When
the object is supported at that point, it will be balanced. If it is supported
at any other point, it will topple.
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