Answer 2:
I know that some spin will give a ball a more
stable/predictable trajectory, which is why you
want to kick a soccer
ball with the inside or outside of your foot
rather than the tip of
your foot. If the spin is more extreme/strong,
it can affect the
trajectory by modifying it. For example, you
need a lot of spin to
perform a shot that allows you to put a corner
kick into the goal -
viewed from the top; the ball has a curved
trajectory in that case. I
assume that it is the spin of the ball acting on
the air by friction
that allows this deviation from a straight line
trajectory.
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