Momentum in Taiji

I am not a fan of trying to use modern science to explain taiji, but sometimes, it does make it easier for us (who have been taught modern science in school) to understand it better. Here is a video I found which tries to explain how the concept of momentum can be used to explain things in taiji.

If you want to know more about the Galilean cannon, you can also check out this video (not related to taiji):

So now we know the science behind "staying rooted".