- #1

mrcotton

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## Homework Statement

Explain why a soldier holding the machine gun will experience a force from the gun

whilst it is firing bullets

## Homework Equations

Momentum is always conserved in closed systems

F= Δmv/Δt

## The Attempt at a Solution

The system has zero momentum then when the bullet is fired we must have an equal but opposite momentum.

The force on the gun is the bullets change in momentum divided by the time that the momentum change occurs in.

So why can't we just say according to Newtons 3rd that there must be an equal and opposite force of the gun on the soldier?

Any help appreciated

D