How you deal with real challenges is what sets you apart as a leader. For every problem, there are a thousand answers, and all of them may work. No one can motivate anyone else. I can point a gun at a Sailor, and get him to run. That is fear, not motivation.
Motivation comes from within.
It is your job as a leader to create an atmosphere where motivation is encouraged and rewarded. It will quickly become obvious who is content to just get by, and who wants to run the show. You don't have all the answers, and you never will. Every time we invent an idiot proof machine, nature invents a better idiot. The moment you think you've seen it all, stand by, it's going to get interesting.