Let’s consider another example, one where no one gets hurt. The key is the distance that the force is applied over. So the next time someone tries to act smart douchey by correcting you on the difference between force/mass, you can tell them that they are in fact doing it wrong. *Slugs is actually the proper unit of mass in imperial, with pounds actually being a unit of force. But we can obviously tell that they didn’t exactly exert the same force on your foot. They key thing to grasp is that this book weighs the same in both cases. Why is that important? Well, to truly understand bring that same book up to eye level… Its mass is 1.2 kilograms (metric) or 0.084 slugs* (imperial). This book weighs 2.7 pounds (in imperial) or 12.0 newtons (in smart people units). Weight is an expression of how much the force of gravity is pulling on something. I used the term ‘weighing in’ very deliberately. Now take the book and rest it on your foot. In my case let’s use the Second Edition of Michael Greer’s translation of Thibault, weighing in at 2.7 pounds. Pick your favorite hard cover HEMA manual, the bigger the better. Weight vs Impact ForceĪ simple example to start. This is specifically talking about thrusts, but the concepts of Momentum and Impulse are further elaborated in Impact Impulse and Momentum, so I suggest you check that out as well. In writing an article about thrusting force, I’ve come to realize that there are some misconceptions about the relationship between force and momentum when it comes to delivering a thrust.
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