Explain why internal forces, or those that act within the system of interest of the object under consideration, are not relevant in solving problems related to the Second Law of Motion. A net external force has no effect in the change in motion. Internal forces, or those responsible for holding a given object together, affect the motion of such an object. A net external force causes a change in motion. Internal forces, or those responsible for holding a given object together, do not affect the motion of such an object. A net internal force causes a change in motion. External forces, o

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