Momentum in physics is about the movement of physical bodies. Why should that have any relevance to something non-physical like the price of shares other than as a descriptive analogy?Momentum in Physics is a fact proven a million times over - in other words it is an objective standard of measure. Rsi is invented by wilder. I personally prefer to follow the objective laws of physics rather that some random idea.
But nothing to stop you using both if that's your cup of tea.