speed
Velocity
Speed is the rate of motion.
the rate of motion is distance over time
The rate of motion is Speed. (V=distance divided by time).
If you are staying in the same position and not moving, then your rate of motion is zero.
The rate of change of motion is called jerk, jolt, surge, or lurch. The rate of change is derivative of motion with respect to time, velocity, and/or position.
If we replace "motion" with a similar term called "velocity", both are rates of change:* Velocity is the rate of change of position (the derivative of the position, with respect to time). * Acceleration is the rate of change of velocity (that makes it the second derivative of the position, with respect to time).
rest
The rate of change in the rate of motion is called acceleration. Acceleration measures how quickly the speed of an object is changing over time.
speed is a measure of the rate of motion.
That is the object's 'speed'.
This is a term used in Asian countries to mean defecate.