# Momentum in a Projectile.

1. Apr 30, 2013

### Toranc3

1. The problem statement, all variables and given/known data
Is momentum conserved in a projectile? I was a bit confused with this. Would it be conserved only horizontally? What if it explodes at its max height?

2. Relevant equations

mv=mv2
3. The attempt at a solution

Last edited by a moderator: Apr 30, 2013
2. Apr 30, 2013

### Staff: Mentor

What are your thoughts? What can change momentum?

3. Apr 30, 2013

### Toranc3

ok so lets say some mass at the top of a projectile explodes. The external force on my system(mass) is the force of gravity. During the explosion though, the force of gravity is small enough to ignore it(compared to the explosion). So momentum is conserved in the x and in the y, starting at the top of a projectile. Is it correct to say that?

4. Apr 30, 2013

### Staff: Mentor

Gravity is acting on the projectile and the resulting fragments, so that influences the momentum in the y direction both before and after the explosion.

5. Apr 30, 2013

### Staff: Mentor

It's generally a good assumption, considering that the explosive forces are high and short-lived, that other forces such as gravity can be ignored during the explosion. So momentum is conserved during the collision.