In physics, rotatum is the derivative of torque with respect to time. Expressed as an equation, rotatum Ρ is: where τ is torque and is the derivative with respect to time . The term rotatum is not universally recognized but is commonly used. This word is derived from the Latin word rotātus meaning to rotate. The units of rotatum are force times distance per time, or equivalently, mass times length squared per time cubed; in the SI unit system this is kilogram metre squared per second cubed (kg·m2/s3), or Newtons times meter per second (N·m/s).