Kinetic projectiles with recoil?

Question

I know I already asked a question about the effect of inelastic collision and the victim, but I was wondering if the man would feel recoil if he was firing the shot because of the Kinetic energy. I know that the man would feel recoil due to the law of conservation of momentum, but I'm trying to find a different resolution.

The thing is, can I still use this as physics because its more based on the law of conservation of momentum because its based on momentum rather than the third law of newton? Because my paper restrict using the same law twice.

Answer 1

First you find the KE of the bullet with the equation KE=1/2m*v^2

Then you find out how much work it would take to move yourself. Assume the coefficient of friction on your shoes is1.00. To feel the recoil you would have to be thrown back about three cm. If the ke of the bullet is one forth what it takes to throw you back 3 cm it probably is not much of a recoil. The lower the KE of the bullet is to the work needed to move you back 3 cm, then you can say it is nothing.

Answer 2

Recoil is also a result of newton's third law of motion (for every action there is an equal and opposite reaction.) The force of the explosion which causes the bullet to be expelled forward pushes the gun backwards.

Answer 3

Newton's laws and laws of conservation are separate things, although the action/reaction law is related to but not the same as momentum conservation. I think you can use both; in fact it is necessary to use both in most cases.

Answer 4

Unless you have the weapon mounted in a rigid frame that absorbs MORE recoil than the weapon produces you are going to feel recoil. Recoil, as you've mentioned, always happens.

Answer 5

The same force that the bullet will strike the victim at will be imparted on you. However you have the distinct advantage of being the one holding the gun whose mass will absorb most of the energy.