Question

why do the calender papers move fotward when we put on a fan ?​

Answer 1

Explanation:

According to the principle of aerodynamics, when air at one side of an object moves with a faster speed, the pressure at this side is decreased whereas its pressure at the other side increases.

Same is the case with aeroplanes when they fly. The speed of air above the wing is more which makes the pressure below the wing more.

Same happens in the case of paper. The fast moving air above it makes the pressure on the other side more due to which it gets flipped forward.