# Why do inelastic collisions conserve momentum?

Ciao; even in inelastic collisions the conditions for conservation of momentum

The system is closed and isolated; so mass doesn't change AND the resultant of the external forces is zero!

In an inelastic collision the only thing that changes is kinetic energy!

Imagine a typical inelastic collision between two cars (that after get tangled together). The resultant of external forces is zero and no mass is added or subtracted exactly as in an elastic collision. The only difference is that some of the initial kinetic energy is used to make some deformation, heat up the two cars, noise…etc:

Spero che ti sia di aiuto!

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In inelastic collisions, kinetic energy is not conserved as some energy is transformed into other forms, such as heat or deformation. However, momentum is conserved due to the principle of conservation of linear momentum, which states that the total momentum of a closed system remains constant if no external forces act on it.

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