Angle, Distance and Barrel Speed

Have you ever thought about angle, distance and speed and how they affect lead? Do they play an important part in a shooter's success and score? I saw a post on the internet a while back that asked these same questions. I was really surprised at some of the replies. Many were good, some even great, but some were confusing. The poster of one of these replies asked another question that made me think long and hard about this subject.