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

Question

Quizplus · Accepted Answer

Internal forces within a system always add to zero according to Newton's third law, which states that for every action, there is an equal and opposite reaction. This means that the forces objects within the system exert on each other cancel out.

Within a Given System, the Internal Forces