# Please,help with energy and momentum conservation

1. Apr 19, 2005

### Vasco

I got a conceptual doubt:Momentum(linear) conservation doesnt depend on conservation of kinetic energy.But,is the opposite true?Can kinetic energy be conserved without the conservation of momentum?

Thanks!

2. Apr 19, 2005

### arildno

Yes, the typical example is a particle which only experiences CENTRIPETAL acceleration from some force (with centripetal acceleration, I mean that the acceleration is orthogonal to the velocity at all times) .
The vector quantity momentum changes continually, yet the particle's SPEED, and hence, its kinetic energy remains conseved.

Last edited: Apr 19, 2005