Momentum and Friction?Watch this thread
Friction decreases the velocity of objects right? So it would decrease the momenta of objects. In an inelastic collision, the kinetic energy of the system is lost to friction, yet conservation of momentum still applies. Why is that? Why do you lose kinetic energy to friction and not lose momentum?
The difference in K.E is not due to friction but due to the type of collision that happened.
P.S If someone can verify this please do. I hope I am right.
In the case of energy there are different types. Kinetic, potential etc.
Kinetic energy is not conserved because this type of energy gets converted into another form in an inelastic collision. (Here maybe heat or sound or potential of deformation.)
The universal principle is conservation of energy. Energy and momentum are two quantities that happen to be conserved. In the case of momentum there is just momentum. No "other forms" for it to be converted into.
You may also like to consider the fact that momentum is a vector quantity while energy is not.
Apply this to the case of two cars which collide head on and both come to rest.
How does this affect the momentum and kinetic energy? Where has the energy gone? What about the momentum?