Electro-magnetic field. You can read about the process in much more detail in theAdventures from the Technology Underground: Catapults, Pulsejets, Rail Guns, Flamethrowers, Tesla Coils, Air Cannons, and the Garage Warriors Who Love Them which can be read or bought at any Borders Book Store (thats where I learned about it).
Provides the energy to push the projectile into motion
Ramrod
If any object is given a horizontal push, then it moves under the gravitational pull [vertical]. This combined motions leads to projectile motion. Same way archery too is projectile motion
Provides the energy to push the projectile into motion
We would object to that statement, and argue that the motion of a projectile after launch is determined by the speed and direction of the launch.
In front of a rail, jump (A) then push (A) again. So, its just pushing A,A in front of a grind rail.
they had guns
I think you mean fuel injection service. It's when you hook up a small container full of a cleaning agent (like a solvent) to the fuel rail and using compressed air push the solvent though the fuel rail and injectors for about 30 minutes while letting the engine run.
You don't. You either need someone else to give you a push, or to push first and jump in. But a better solution would be to place a powered rail, with a column of two blocks behind it, at the end of the track, and a button on the side of the top one. Place the minecart on the rail, and get into it. Pressing the button will activate the rail, moving you along.
Firing pin strikes primer, primer ignites powder in case, expanding gases push projectile down the bore.
Gravity feed means just that. Some BB guns feed BB into the chamber using a spring to push them. When a BB gun is gravity fed it just means the next BB falls into the loading chamber there is no spring to push them.
pop up with your heel to rail stand and carefully push down front or back foot to manual or nose manual