a fielder must have the ball in their glove or hand and touch ( or tag) the base runner
He could also get out if he were to leave a base early before the next batter has hit he ball :) Mo Fo
It's called a force. The runner is being forced to proceed to the next base by the batter/runner.
The rules state that runners must advance by legally touching each base in succession. In this case, the runner must touch 2B before advancing to 3B, and if she does not, she can be called out on appeal.
When there isn't a runner behind them forcing them to run. For example, if a runner is on 2nd base but there is no one on 1st base, the runner must be tagged on their way to 3rd in order to get them out. However, if there IS a runner on 1st, the 3rd baseman can simply touch the base because it is a force out.
Yes. He must tag the base.
The pitchers mound
In baseball? This is not allowed. The lead runner must attempt to advance to the next base; if it is tagged with the ball before the runner reaches it that runner is out.
The base runner can not advance on a foul ball, he must return to the base he was at before the foul ball was hit. A base runner may advance on a caught foul ball, but must tag up and advance only after the ball is touched by a defensive player. To answer your original question, yes, all base runners must return to the base they occupied prior to the foul, and must touch that base before play is continued.
Runner is out. Other runners must return to the base they occupied at the instant of the interference. If the runner was trying to break up a double play, the other runner is also out.
an out
yes, but runner must not advance to next base until ball is caught by defensive player.
You basically said the term in your question. =) It is called a Force Out.
If it is a force (i.e. there are people on all the bases behind the runner) play, then yes, the baseman needs to touch the base to get the runner out. If the runner is not required to move to that base, then the baseman must tag the runner to get him out. The baseman does not NEED to touch the base to record the out. The defense may tag the runner OR the bag.