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).
December 2017 marks a huge change in the law allowing for the expunction of solitary, non violent felony and misdemeanor convictions. Prior to the change, the waiting period to have a conviction expunged was 15 years for a felony or misdemeanor. The new law shortens the waiting time for felonies to 10 years and misdemeanors to 5 years. The time starts to run from the end of any active jail time or probation. This is a huge step forward for North Carolina. But there is a catch.