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  4. 3-8 A train A runs from east to west and another train B of the same mass runs from west to east at the same speed along the equator. A presses the track with a force F1 and B presses the track with a force F2 :

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Q. 3-8 A train $A$ runs from east to west and another train $B$ of the same mass runs from west to east at the same speed along the equator. A presses the track with a force $F_{1}$ and $B$ presses the track with a force $F_{2}$ :

Work, Energy and Power

Solution:

The normal force between the train and track will be equal to its weight minus the centrifugal force on the train. The force will be higher in case where the centrifugal force is less so the lower speed train will press the track with more force. As relative to earth speed of both trains are equal so the train which is running west to east will move fast will press the track with less force hence option (A) is correct.