The internal forces within the train (the forces each car exerts on its neighbors) are equal and opposite, according to Newton's third law. This means they cancel each other out when considering the train as a whole. Therefore, the only force that matters for the acceleration of the train is the external force, which is the force the engine applies. - explain further

Answer rating: 100% (QA)

Newtons third law of motion states that for every action there is an equal and opposite reaction Applied to the context of a train this law implies th... View the full answer