specify 2 difference between internal and external forces.
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Internal forces are the forces that emanate from within a system. The system must be defined by you/problem.
External forces are the forces that emanate from outside the system.
An example: Let us say, our system is earth-sun system. You see, we have defined the system first. Now, the force of earth on sun, and the force of sun on earth ( Mutual forces of gravitation, say ) are the internal forces.
External forces are the forces that emanate from outside the system.
An example: Let us say, our system is earth-sun system. You see, we have defined the system first. Now, the force of earth on sun, and the force of sun on earth ( Mutual forces of gravitation, say ) are the internal forces.
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