This can probably explain it better than I can. Note the first paragraph. Dynamic starts getting complicated and variable; and especially if you’re not familiar with cam overlap, cam timing, and so on…
http://www.enginebasics.com/Advanced%20Engine%20Tuning/Static%20vs%20Dynamic.html
Dynamic doesn’t really come into play for DIYers and mechanics in the field. That’s mostly something for automotive engineers and performance engine builders to be involved with.