Question:
Do magnetically powered "rail guns" recoil less?
Replies:
No. No kind of gun can be truly recoil less. Newton's third
law, the conservation of momentum, guarantees this. Even a laser has some
recoil, since photons have momentum. In the rail gun, the momentum given to
the projectile must be matched by the momentum given to the "stationary" part
of the gun. If the gun is firmly anchored, this momentum is given to the
entire mass of the planet and you will not see much recoil. But the force on
the gun during the launch will be quite high, equal to the force on the
projectile.
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