Measuring "How Much" In Velocity Units
  • What is a "velocity" amplitude ? Technically, velocity measures how much the displacement is changing over a period of time.
  • The units of measure are inches per second or millimeters per second. 
  • With sinusoidal motion the velocity constantly changes as the displacement changes. 
  • Since the velocity is constantly changing over time, measuring velocity amplitude over time generates a sine wave just as measuring displacement amplitude does.