1. Think about the forces acting on a train engine and the train cars that it...

1. Think about the forces acting on a train engine and the train cars that it pulls.
a.) Draw a force diagram for the 5 forces (one of the forces is friction) acting on the engine as it accelerates forward along the rails.
b.) Draw a force diagram for the 4 forces acting on a train car as it is pulled by the accelerating engine.
c.) By Newton’s 3rd Law, the train car pulls backward on its engine exactly as hard as the engine pulls forward on the train car. Since Newton’s 3rd Law is correct, the force by the engine on the car should be equal and opposite to the force by the car on the engine. Therefore, the entire train shouldn’t go anywhere. Using your force diagrams from parts (a) and (b) above, explain why this analysis is wrong. That is, show that there is a net force on the engine and the train car.

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genius_generous answered 1 year ago

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