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).
Second, on your criminal record, the conviction never goes away. Expungement for a traffic misdemeanor is not available. The thing to remember is that if you have a 2nd offense drinknig charge within 7 years of the first, you can be charged with OWI 2nd. In your lifetime, should you get a 3rd charge, it is a 5-year felony.