Yes, a genuine Katana can sever a person's throat in one blow. The sharpness and flexibility of this blade are legendary. Yes, you can cut someone in half (ideally one with a tiny waist), especially if you're riding a horse and have enough speed. However, due to the nature of these blades they tend to be dull after just a few uses so they don't produce as much blood as people think.
The truth is that a sword can only do what you allow it to do. If you're not willing to work with what you've been given, then you should never get behind a sword. A Katana isn't some kind of knife that will cut everything in its path. It has limits just like everyone else.
People love to tell stories about how knives can kill, but the reality is that most weapons are designed to cause injury, not death. There are many different ways to injure or even mutilate someone, but only a few that actually lead to their demise. For example, a knife can cut muscles, bones, organs, etc.. But unless those wounds are treated immediately, they will likely result in death. This is exactly why doctors must perform surgery, use anesthesia, and give antibiotics before anyone can survive a knife attack.
Just because something can happen, doesn't mean that it will.
Can a katana truly chop a person in two as in the movies? If you think about it, it doesn't take much strength to accidentally slash oneself rather deeply, therefore an intended cut can surely cut through skin, muscle, and bone, especially in the hands of a competent swordsman. In fact, several historical swords have been found with cuts deep enough to go through the hand and arm.
However, this does not mean that they are designed to be used for such purposes. The cutting edge of a sword is only meant to slice through flesh and armor, so a heavy blade is needed to do significant damage to bone or human tissue. For example, the blade of a samurai sword is always slightly curved, which means it can't easily go straight through something hard like bone.
Also, beware of stories about people who have used their swords to hack through limbs or other body parts, because many of these stories are simply fake. There have been many cases where people have pretended to kill themselves so they could collect on life insurance policies, and sometimes they even succeed! A suicide would be difficult to detect without a witness, so some criminals have used this tactic to create the illusion that a death occurred when it was actually just an act.
In conclusion, yes, a samurai sword can cut though bone if used intentionally. However, we recommend you use a knife instead, since fewer people will believe you killed yourself this way.
True, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true A katana, not an axe, is a slicing weapon. It has the ability to and does cut quite deeply and effortlessly. It has the ability to remove limbs, although cutting all the way through a torso would be difficult and futile. Your sword would most certainly become entangled. It has the ability to cause death by exposure to airway obstructions or blood loss.
It's physically conceivable; it's just extremely unlikely. Historically, most swords were neither broad or sharp enough to make a clean cut clean enough to sever a man in half. Not to mention that most individuals are incapable of swinging a sword with enough force to cut someone in half. The person doing the cutting would need to be very strong.
The only real way to divide a human body evenly is with an axe or a knife. A sword can do some damage, but not much. It might be able to break bones or cut skin, but never really get anywhere near dividing your victim into two equal parts.
Even if you could cut in half a human being with a sword, they'd probably both be dead within minutes. The only reason such attacks happen in movies and novels is because it's easy to film/write a big battle scene where everyone does something amazing and fights off dozens of enemies at once. In reality, people don't have time for this kind of thing; they're either killed by the first attacker who gets a chance or they succumb to their injuries after a few moments of pain/shock.