Hooks fly low and slices fly high because of the different type of spin the ball has coming off the clubface.
A hook ball is caused by the clubface being in a closed position
and traveling in a more shallow arc. The closed clubface decreases the clubface loft, resulting
in a lower trajectory and roll to the ball when it hits the ground.
Whereas, a slice is caused by the clubface being in an open position
and traveling in a steeper arc, which not only increases the loft but also the side-spin as
well as the backspin - resulting in a high flying soft hit. The ball will bounce right, with
little run when it hits the ground.
To hit a low controlled fade or slice, play the ball a little farther back in the stance
than normal, with the clubface in a slightly hooded position, and carrying the hands through
impact ahead of the club head. This decreases the loft of the clubface even though the
clubface will be in an open position.
The low hook is easy, but the high hook is one of the more difficult shots for most
players. The ball must be placed forward in the stance, allowing the clubface to
contact the ball slightly after reaching the bottom of the arc - in other words,
slightly on the upswing. The clubface must pass the hands prior to contacting the ball.
With the ball played forward, the clubface contacts the ball slightly on the upswing
and passes the hands before impact, which closes the clubface. Result: A high
flying hook. This type of hit can only be executed when the
ball is teed up.