First slide

Motion of centre of mass

Question

Statements :
a) The motion of the centre of mass can be studied using kepler's laws of motion.
b) The internal forces will not effect the motion of the centre of mass

Easy

A

both a and b are true
B

both a and b are false
C

a is true b is false
D

a is false b is true

Solution

For a system of particles , F_ext = M _sys . a_cm
In a system of particles , the particles may interact with each other through gravitational force , electro magnetic force and any other real force . These forces are action - reaction pairs and cancel each other . there internal forces have no contribution to the net external force . Hence statement - (b) is true

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