Originally Posted by Raul_SJ
I will study this...
I am not clear on the "8 o'clock to 2 o'clock" brushing motion.
I am using that for a Topspin serve -- where the bounce is pretty much straight ahead.
When we hit topspin serve the theta angle is usually around zero degree ϴ
=0°. Then, according to formulas (1), see post #1
Gyrospin = V
) = V
SpinHor*sin(0°) = 0
So, the ball doesn’t bounce to the right.
Because of different magnitude of ϴ
we can swing from 8:00 to 2:00 and produce different ball’s rotation.