So, I opted not to post this in Science Fiction and get my thread locked~ I watched this video and it seemed quite ludicrous to me. The man in the video measured sword speed (which I assumed was angular velocity) with mph. He then continued to say that linear momentum applies when swinging a sword. Last but not least, he expands on centrifugal force and gives an equation for centrifugal force, and uses it to debunk this science-fictitious sword. However, in my one community college physics class, I learned that centrifugal force is not a real force. I forget whether it's a combination of two forces, or just one force and a pre-existing velocity on the object. What are your expert opinions on this video?