Physics question please and thanks!?

Question

The oscillations of an actual spring-block system slowly reduce in amplitude and finally the system comes to a halt. What happens to the energy of the system? Wouldn't this violate the law of conservation of energy? Why or why not?

Answer 1

The energy of the system is lost to heat. This heat is generated by friction with the air and internal loses within the spring (due to inelastic processes). Thus the law of energy conservation is maintained.

Answer 2

Friction causes the energy in the system to turn to heat in the air or surface it's on.

Answer 3

energy is also lost due to sound