Question

Two identical trains A and B move with equal speeds on parallel tracks along the equator. A moves from east to west and B moves from west to east. Which train exerts greater force on the track?

• A. A
• B. B
• C. they will exert equal force
• D. The mass and the speed of each train must be known to reach a conclusion.

Answer 1

The correct option is A A

Working in the frame of universe:

$mg-N=m{\omega }^{2}R$

$N=mg-m{\omega }^{2}R$

Earth moves from west to east.

Now, since the train B moves from west to east, its $\omega$ is greater than A.

Hence, $N_B<N_A$