No. Ever hear of a cannonball?
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No, for instance a warship can fire on the move.
projectiles can be fin or spin stabilized
No. 38 = .357 projectiles; 380 = .355 projectiles from a shorter case
Because they both propel projectiles at velocities that can cause injury.
No. Missiles are pretty fast but Railgun projectiles are much faster than missiles.
Yea, they can.
Projectiles can move upward or downward or at an angle to the vertical. The only force on a projectile is gravity.
The term itself means the study of the motion of projectiles, or the science of designing projectiles for maximum peformance.
HEAT (high explosive antitank) projectiles are specifically designed to attack armored vehicles.
If the projectiles are small enough, they can travel around the world from a 1-pound explosion.