White board discussions

During the past couple white board discussions in my 3B physics class I have observed that our discussions have been dominated by some people. I have noticed that some people will keep pressing what they think is right until others believe them but many of the people in the circle are confused on what that person is trying to say. Most of the time we have great discussions with many people involved but the discussion usually turns into a discussion driven by a couple of people. There is some people in the class that need to participate more in discussion.  I don't think some of them in the class have said a single word during the discussions and a part of that might be due to the fact that certain people dominate the whole conversation. I try to ask the questions I have or I try to voice what I think is right but I think that going forward I need to talk a little bit more to help involve others in these discussions.