how do you "pop a wheelie/stoppie"?

[ang_kulit49]

this is for my physics assignment. i want to know the basic principles of physics that are at work when one is trying to "pop a wheelie/stoppie" thanks alot! please provide scientific terms and explain them if you may. thanks again!

 

[oldretiredfart]

i can do it on my motorcycle, but i have no idea what the proper physics terms are for it