A short train (an engine plus four cars) is accelerating at 1.70m/s2 . The mass

Question

A short train (an engine plus four cars) is accelerating at 1.70m/s2 . The mass of each car is 3.40Ý104kg , and each car has negligible frictional forces acting on it. In solving this problem, note the importance of selecting the correct set of cars to isolate as your object.

Part A: What is the force of the engine on the first car?

Part B: What is the force of the first car on the second car?

Part C: What is the force of the second car on the third car?

Part D:And what is the force of the third car on the fourth car?

Explanation / Answer

A. The engine is pulling all four cars at the specified acceleration. Then
Force = 4 x 34,000 x 1.70 = 231 200 N

B. Now the first car is pulling the other three cars.
Force = 3 x 34,000 x 1.70 = 173 400 N

And similarly C. Force = 2 x 34,000 x 1.70 = 115 600 N;

D. Force = 1 x 34,000 x 1.70 = 57 800 N

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