Its called Topspin.
The ball keeps moving forward because of its momentum, which is not a force.
Massively, that is if you want to become a serious tennis player. Every professional tennis player in the world uses top spin, and for two simple reasons: 1: Due to the forward rotation of the ball, the ball will dip more quickly than a shot without spin, thus allowing a player to hit the ball harder/higher as it will fall into the court lines quicker. 2: Again due to the forward ball rotation, upon hitting the ground the ball will bounce both higher and faster than a flat shot, thus making more difficult for an opponent to hit or to get in the correct position to strike the ball.
It is a push. See you push it forward with the tennis racket, making it go forward, away from you. When you pull something, you're bringing it toward yourself. But when you hit a tennis ball, you push the ball away from you.
It is called a swing.
Moon ball.
Tapping it.
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The machines tennis players use to shoot tennis balls are called tennis ball machines. Tennis players also call them ball machines, but a Google search for "ball machine" might bring up machines from different sports.
a tennis ball
Tops probably refers to tops-spin, which is where the ball spins forward, and when it hits the ground speeds up.