Velocity = High-Low / Time. Time is changeable to minutes, hours, or days. Seconds is the default. In physics, Velocity = distance / time.
Velocity can be a good indication of price action divided by time, differing from indicators such as ATR and Volatility indicators that do not include time.
The Acceleration/Deceleration Indicator (AC) measures acceleration and deceleration of the current driving force.Average Directional Movement Index (ADX)
The Average Directional Movement Index Indicator (ADX) helps to determine if there is a price trend.