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AP® Physics C: Mechanics

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Forces on Train Cars

APPHMC-NOIJFZ

Train cars are connected to each other by couplers, which are under tension and compression when the locomotive speeds up and slows down respectively.

What happens to the tension in each coupler from the first train to the last train when speeding up?

What happens to the compression in the couplers when the train slows down?

A

The coupler for the first car has the most tension speeding up and the most compression slowing down.

B

The coupler for the first car has the most tension speeding up and the least compression slowing down.

C

The coupler for the first car has the least tension speeding up and the least compression slowing down.

D

The coupler for the first car has the least tension speeding up and the most compression slowing down.

E

tension and compression are equal for each coupler in the train.