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Physical impossibilities of martial arts in Chinese movies?

I'm doing a project in physics class that explains why these feats in films are PHYSICALLY [as in, by the laws of physics] impossible. I want to address mainly the fighting scenes that happen in the trees, but also things like the knife throwing in House of Flying Daggers and diving for the sword in Crouching Tiger, Hidden Dragon.

Explanations, websites, formulas, laws, anything is helpful since there really isn't much out there on these movies. Thank you!

Let's just say gravity.

For every one of your examples, gravity is the answer.

In the Chinese fighting movies, the people end up flying entirely horizontally, just sort of suspended in midair. Unfortunately for them, gravity exerts a constant force upon each of us that prevents this. We accelerate downward at 9.8 m/s^2 any time we leave the earth's surface. Here are some things to think about in those movies:

1) When they jump, they go upward at a CONSTANT SPEED. This is impossible! They should be slowing down. There's no way they're exerting a force to keep a constant speed against earth's gravity.

2) Those knives... I have seen these movies where the knives fly thousands of feet before impaling someone. Gravity acts on those, too. Unless they are able to cover those thousands of feet in under a second, they will have fallen five feet in that second... missing their target. How sad!

3) This happens in more than those movies, but have you seen how people fly backward after being hit? The same thing. The way they fly totally horizontally through the air is impossible. You may also note that when hitting the ground they sometimes slide a hundred feet or so before stopping. They weren't going THAT fast... the friction force would have stopped them.

That's all I can really think of right now. Any time they're flying vertically or horizontally at a CONSTANT SPEED, it's against gravity, and it is wrong. Have you seen how softly some of these guys hit the ground after falling from a building? Laughable!

On that note, think of the impulse equation. Impulse is the change in momentum. When a person changes from even 10 m/s to 0, the force as they hit the ground is unreal.

I really really hope this stuff helps you and gives you food for thought. Take care, and good luck! Physics is fun.

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