Physicists use some basic terms when they look at motion. How fast an object moves, its speed or Velocity, can be influenced by forces. (Note: Even though the terms 'speed' and 'velocity' are often used at the same time, they actually have different meanings.) Acceleration is a twist on the idea of velocity.
Expungement is the legal process by which a court removes or erases all records of a criminal conviction, even if it is a felony conviction. Your conviction will not simply disappear on its own even if you wait 10 or 20 years - you have to take action (see how long does a felony stay on your record).
conviction, or three (3) years from the completion of the person's sentence, unless the prosecuting attorney consents in writing to an earlier period, the person convicted of the felony may petition a court to expunge all conviction records, including records contained in: (1) a court's files; (2) the files of the department of correction;