# Conservation of momentum in an inelastic collision with friction

## Homework Statement

a ball falls in a truck loaded with sand with velocity v having horizontal and vertical component. The angle under which it enters the truck is α, the mass of the ball is m of the track loaded with sand is M. What happens with the momentum after the collision?

## The Attempt at a Solution

This should be considered as completely inelastic collision.
In vertical direction the momentum before the collision is the momentum of the ball mcosv.
After the collision the track is not moving in horizontal direction, but the momentum should be conserved. The ball sinks in the sand, so is this the explanation?
In horizontal direction the momentum before the collision is msinv. What is the momentum after? There is friction during the collision. It should be (m+M)v', but what about the friction?

wukunlin
Gold Member
What happens to the temperature of the sand once the ball makes contact?

It does not effect the momentum.

wukunlin
Gold Member
really? what does temperature tell you about the speed of particles in a substance?

Redbelly98
Staff Emeritus