True or false fluids?

Question

FLUIDS....

True or False? and why?

A sheet of canvas is fixed to a wooden frame. The frame is placed in a subway station so that it is parallel to the passing trains. As a train comes in and decelerates, the canvas bulges away from the train. As the train leaves and accelerates, the canvas bulges towards the train.

Answer 1

When the train arrives at the station,it pushes all the air and takes it's place in that area.Thus the canvas being light cannot prevent buldging away from the train due to the air blowing with such force.
Likewise when the train moves out of the station, it drains all air with it and thus the canvas bulges towards the train.

Answer 2

Hi. If the train is considered to have a very long length such that the deceleration and acceleration occur when the canvas is beside the train there would exist a low pressure due to fluid movement caused by friction with the train's surface. This low pressure is dependent only on the train's movement, not the pressure in front of or behind the train. The canvas should always bulge in toward the train, in my opinion.

Answer 3

true, when the train first comes by the canvas, it pushes air out of its way as it travels, and the air goes out to the sides, and wud push the canvas away, as the end of the train then passes the canvas tho, it leaves behind a vacuum, which the air quickly rushes to fill, and the air going toward where the train just was would push the canvas toward the tracks