Shock absorber is a precise hydraulic component, shock absorber piston with the vibration of the vehicle in the working cylinder reciprocating movement, the oil in the shock absorber housing repeatedly flows from one inner cavity through a number of narrow pores into the other inner cavity, at this time, the friction between the hole wall and the oil and the internal friction of the liquid molecules form a damping force on the vibration. The vibration energy of the vehicle is converted into heat energy, which is absorbed by the oil and the shock absorber shell, and then dispersed into the atmosphere. 

In simple terms, it converts kinetic energy into heat.