Having a Hard Time Getting Members Involved

[Cal]

I am a member of a rookie team that had an "interesting" dynamic during the last year. Of our 13 members, 3 did 95% of the work. The three of us tried to involve the other members, but they were either uninterested, distracted, or were scared to ask how things work and, by the competition, didn't have anything that they could do to help because they were not involved enough during the build season to know how our robot worked.

I think most of them want to learn how to do things, and the mentors and students who were working on the robot routinely tried to get them involved, but all of our attempts to teach them things and get them more involved have failed. Does anyone have any ideas that could help us get them involved? I would really appreciate some help.