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centre of mass class 9 | metric part 1 physics, chapter 4 | 9th class physics | centre of mass
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4.6 CENTRE OF MASS
It is observed that the centre of mass of a system
moves as if its entire mass is confined at that point. A
force applied at such a point in the body does not produce
any torque in it i.e. the body moves in the direction of net
force F without rotation.
Consider a system of two particles A and B
connected by a light rigid rod as shown in figure 4.16.
Let O is a point anywhere between A and B such that the
force F is applied at point O as shown in figure 4.17. If the
system moves in the direction of force F without rotation,
then point O is the centre of mass of the system.
Does the system still move without rotation if
the force acts elsewhere on it?
(i) Let the force be applied near the lighter particle
as shown in figure 4.18. The system moves as
well as rotates.
(ii) Let the force be applied near the heavier particle
as shown in figure 4.19. In this case, also the
system moves as well as rotates.
Centre of mass of a system is such a point
where an applied force cause

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