define a system, internal forces and external forces
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1
Answer:
External forces are forces caused by external agent outside of the system. Internal forces are forces exchanged by the objects in the system. To determine what part should be considered external and internal, mechanical system should be clearly defined.
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3
Answer:
Internal forces
Which are caused in size object and this will not effect on center on mass
Like blast of bomb etc...
External forces
Cause buy external agent whether directly or in fields and effects on center of mass
Like gravity, friction etc..
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