The ball change its direction due to pressure difference in air(connect to ball) by the time of moving of the ball, will rotate about a particular axis of rotation.
Imagine a ball spinning about a vertical axis & moving in some velocity in horizontal direction (in still air).
Let’s think the situation that, center of the ball is at rest and it spin in anticlockwise direction, about a vertical axis .The velocity of air is in opposite direction that of motion of the ball(as shown in the fig).
The speed of air(contact to the ball) at point A is increase by the spin of ball & the speed of air at point B is decrease by the spin of ball. So air pressure at A is decrease as compare to pressure at B[AS TO BBERNOULLI’S EQUATION(P+ρgh+1/2ρv2=constant)].
(P= Pressure, ρ=Density, g=acceleration due to gravity, h=height, v=velocity of air)
(P= Pressure, ρ=Density, g=acceleration due to gravity, h=height, v=velocity of air)
As per pressure difference of air (less at A & more at B)the ball change its direction(towards point A).
It’s happened in everything(depend up on shape) which spinning continuously.
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