Usually because the ball hits in what you could call the weakest part of the bat. If the ball hits directly on a grain, or a weak part of a poorly made bat. the bat will crack. Also, the ball can break the bat at the handle, where the bat is thinnest, due to the massive amount of force the ball is traveling with as it comes in contact with the bat.
Yes. It also sounds like a crack.
It depends on the player and how hard they can strike the ball, some can really crack the ball.
If the ball hits the line it's a FAIR BALL
If you swing and miss and the ball hits you, it is a strike and a live ball. If you swing and the bat makes contact with the ball and the ball hits you while you're in the batter's box, it is a foul ball and a dead ball.
That would be the batter.
The balL hits it
In regular baseball rules, the ball is still live, even if it hits the ground first, until it hits the batter, then it becomes a "dead ball". If it never hits the batter, its still a live ball.
If the baseball hit the ground in foul territory, the ball is a foul ball. If the baseball hit the ground in fair territory, and the batter/runner is still in the batter's box when the baseball hits him, it is a foul ball. If the baseball hit the ground in fair territory and the batter/runner is out of the batter's box when the baseball hits him, the batter/runner is out and the ball is dead.
In baseball or softball, when a batters hits the ball and makes it safely to third base it is called a triple.