is it necessary that all the internal forces of a system must add up to zero

Dear Student,

Yes,sum of all internal forces will be always zero.
For example,think of an object floating freely in an empty universe so there are no external forces acting on it.

During any time period when the object stays the same shape and size, the internal forces must all be balancing one another out. If the internal forces were not in balance, they would cause the object to deform (or implode or explode). 

Also we see all objects around us in same shape and size normally,when no external force is acting,hence all internal forces are balanced.


Regards

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