YES the catcher is SUPPOSED to block the plate as long as he has the ball. if the batter swings and hits the catcher the runner would return to third and the batter awarded first base. If the bases were loaded the catchers interference would force the runner home.
No... The base runner is never called out when the ball is thrown and hits the runner ...
Assuming the catcher is near home plate, the runner has to slide. If he doesn't and knocks the catcher down he is out. If the catcher is up the baseline and is waiting to make the tag the runner would be called out for crashing into him. If the slide knocks the catcher down, the outcome of the play would depend on whether the catcher maintained control of the ball during the tag and whether the runner touched home plate.
It is only the "smart" thing to do..
A home plate collision is usually the case of a base runner that was on one of the bases trying to reach home plate in order to score while the other team's Catcher is trying to block home plate in order to prevent the base runner from touching home plate in an effort to prevent a run from scoring and the runner and the base runner usually slides into the Catcher that is blocking home plate which is what one example of a home plate collision is.
no as long as the batter i the batters box and not on home plate he can remain in the batters box even if the baserunner is stealing third the catcher would have to move to throw it.
When the batter is standing on the plate.
Yes, runner cannot intentionally dislodge ball from fielders glove.
The catcher can cause a balk, but the balk is charged to the pitcher. If, during an intentional walk, the catcher steps out of the catcher's box before the ball leaves the pitcher's hand, it is a balk. Or, if a runner is trying to score from 3rd base by a steal or squeeze play and the catcher touches the batter or the batter's bat, or steps on home plate or in front of home plate without the ball, it is a balk.
Zero. The runner will be called out on batter's interference if the throw is obstructed in any way.
the player is safe. catcher must have control of the ball