Part 3/9:
Newton’s third law declares that for every action, there is an equal and opposite reaction. When a force acts upon a mass that is either stationary or moving at a constant velocity, an equal and opposite inertial force appears. Newton attributed this inertial force to motion within a non-inertial reference frame. However, questions arise regarding the interaction between a so-called 'absolute space' and observable inertial forces, which seem questionable when considering the physical properties of space.