It does apply when you swing them. When the sword, even when using a downward swing, hits something that it can't pass through, it will not cut it (you already said this).
As the sword is cutting through an object, it's losing forward momentum (energy). As it's losing energy, it's overall cutting power is decreased.
Your sword can be forged from high-grade steel supplemented by CNTs, with an edge to match, but if you don't have the strength behind your swing, your blade is nothing more than a useless piece of metal.
As the sword is cutting through an object, it's losing forward momentum (energy). As it's losing energy, it's overall cutting power is decreased.
Your sword can be forged from high-grade steel supplemented by CNTs, with an edge to match, but if you don't have the strength behind your swing, your blade is nothing more than a useless piece of metal.