If a person is standing near a fast moving train there is a danger that he will fall towards it. Explain why.

A person is standing near a fast moving train will tend to fall towards it because of Bernoulli's principle.
The molecules of air between the person and the train is high due to the dragging effect. And, the velocity of the air molecules behind the person is constant. Therefore, as per Bernoulli’s principle, a pressure difference is created. So, the air behind the person pushes them towards the train and hence he falls towards the train.