Within a given system, the internal forces
A) are always balanced by the external forces.
B) all add to zero.
C) are only determined by subtracting the external forces from the net force on the system.
D) determine the motion of the system.
E) are measured with a gravimeter.

Question

Quizplus · Accepted Answer

According to Newton's Third Law of Motion, every action has an equal and opposite reaction. Therefore, within a given system, the internal forces will always add up to zero. This is because for every force acting in one direction, there will be an equal and opposite force acting in the opposite direction, resulting in a net force of zero.

Within a Given System, the Internal Forces