Question

While travelling in a train, it appears that the trees near the track are moving whereas co-passengers appear to be stationary. Explain the reason.

Answer 1

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While moving in a train, our position with respect to the surrounding (or ground) and time is changing. That means, we are also in motion with respect to the stationary trees outside. This means, there is some relative motion between us.

• Relative motion is not zero.

Hence, we feel that the trees are moving considering ourselves at rest because we are sitting inside the train.

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Now our co-passengers are also moving along with us with the same speed as that of the train. For us, they are also in rest because now there no relative motion between us.

• Relative motion is zero.

Hence, they appear to be at rest as we are comparing it with us.