1. Think about the forces acting on a train engine and the traincars that it pulls.
a.) Draw a force diagram for the 5 forces (one of the forces isfriction) acting on the engine as it accelerates forward along therails.
b.) Draw a force diagram for the 4 forces acting on a train car asit is pulled by the accelerating engine.
c.) By Newton’s 3rd Law, the train car pulls backward on its engineexactly as hard as the engine pulls forward on the train car. SinceNewton’s 3rd Law is correct, the force by the engine on the carshould be equal and opposite to the force by the car on the engine.Therefore, the entire train shouldn’t go anywhere. Using your forcediagrams from parts (a) and (b) above, explain why this analysis iswrong. That is, show that there is a net force on the engine andthe train car.
