A particle oscillating under a force $\bar{F}=-k\bar{x}-b\bar{v}$ is a (k and b are constants)

A particle oscillating under a force $\bar{F}=-k\bar{x}-b\bar{v}$ is damped oscillator. The first term $-k\bar{x}$ represents the restoring force and second term $-b\bar{v}$ represents the damping force.