# Martial arts and physics

I have to write an extended essay on the application of
physics in martial arts any sort of help would be welcome.

 shygrneyzs Posts: 5,029, Reputation: 4842 Uber Member #2 Oct 7, 2007, 10:18 AM
There are quite a few articles on this relationship. Look at the following and take your pick of reading:
physics and martial arts - Google Search
 Clough Posts: 27,302, Reputation: 8524 Uber Member #3 Oct 10, 2007, 12:30 PM
Is there any particular information about the application of physics in martial arts that you are having trouble finding or understanding? If so, what are they, please?
 eawoodall Posts: 232, Reputation: 48 Full Member #4 Dec 9, 2007, 07:12 AM
Quote:
 Originally Posted by Clough Is there any particular information about the application of physics in martial arts that you are having trouble finding or understanding? If so, what are they, please?
I have answered this question many times.

Basic physics

Moment arm = weight times length from focal point ==measured in pound feet.
Torque = rotational energy measured in foot pounds.
To hold a 100 pound weight still at the end of a 1 foot long pole requires 100 foot pounds of torque because the 100 pound weight at the end opposite the end at which the force is exerted has 100 pound feet of moment arm.

Energy = mass times distance.
Rate of change of distance is v.
E=(mv^2)/(2) kinetic energy.

The velocity squares the energy of impact. The mass only multiplies.

You hit with twice mass you two times harder.
You hit with twice velocity you hit four times harder.
You hit with twice mass and velocity you hit eight times harder.
You hit with three times the speed and hit nine times harder.

Velocity is much more important than just mass. And that is before considering if you move that fast you can hit them before they can hit you, even if they start to swing first!

And the smaller the surface area the more pounds per square inch for the same amount of applied force so a smaller amount of contact area with target hits better than a wide contact area, if you want to increase pounds per square inch.

P=mv. Momentum equals mass times velocity

Also consider the movement of the hips, shoulders, legs, length of stepping forward, or the arc distance of angular velocity when pivoting, in your calcutations of distance moved.

If you are off the ground (like in kendo), and let whatever you make contact with become the point of you trying to stay off the ground (put your body weight into it) then you have put your entire body weight into the blow (strike). And your entire body weight is more force (f=ma==w=mg.weight is mass times gravity, and a type of force, ie has the same dimensionality or units) than most people bring to a strike.

I hope this helps. Eawoodall
 Clough Posts: 27,302, Reputation: 8524 Uber Member #5 Dec 10, 2007, 12:12 AM
Quote:
 Originally Posted by Clough Is there any particular information about the application of physics in martial arts that you are having trouble finding or understanding? If so, what are they, please?
Quote:
 Originally Posted by eawoodall i have answered this question many times. Basic physics Moment arm = weight times length from focal point ==measured in pound feet. Torque = rotational energy measured in foot pounds. To hold a 100 pound weight still at the end of a 1 foot long pole requires 100 foot pounds of torque because the 100 pound weight at the end opposite the end at which the force is exerted has 100 pound feet of moment arm. Energy = mass times distance. Rate of change of distance is v. E=(mv^2)/(2) kinetic energy. The velocity squares the energy of impact. The mass only multiplies. You hit with twice mass you two times harder. You hit with twice velocity you hit four times harder. You hit with twice mass and velocity you hit eight times harder. You hit with three times the speed and hit nine times harder. Velocity is much more important than just mass. And that is before considering if you move that fast you can hit them before they can hit you, even if they start to swing first! And the smaller the surface area the more pounds per square inch for the same amount of applied force so a smaller amount of contact area with target hits better than a wide contact area, if you want to increase pounds per square inch. P=mv. Momentum equals mass times velocity Also consider the movement of the hips, shoulders, legs, length of stepping forward, or the arc distance of angular velocity when pivoting, in your calcutations of distance moved. If you are off the ground (like in kendo), and let whatever you make contact with become the point of you trying to stay off the ground (put your body weight into it) then you have put your entire body weight into the blow (strike). And your entire body weight is more force (f=ma==w=mg.weight is mass times gravity, and a type of force, ie has the same dimensionality or units) than most people bring to a strike. I hope this helps. Eawoodall
I'm not into martial arts, so I don't know if the above information is correct. I am going to assume that it is correct, though. Thanks for providing it!

However, it would be good to know how the above would be applicable to someone writing an essay, as Ahmad Bilal has indicated in the original question, since we don't know what kind of essay Ahmad Bilal was supposed to write? Simply "Application in Physics" does not tell us the type of essay that was to be written. So, it would help to also know from Ahmad Bilal as to what type of essay was to be written and how the above information could be integrated into the essay.

## Check out some similar questions!

Martial arts movie [ 4 Answers ]

About 15 to 20 years ago I saw a movie which I can no longer recall the name of. The movie was about 5 or 6 guys who used to be in the same military unit together- who come together to help save a town or what not. Of the characters I can remember- one was drunk living in a salvage yard, one was a...

Martial Arts and Physics? [ 25 Answers ]

Are there any books out there that treat martial arts from a physics point of view? Even better- Are there any teachers, professors, or instructors out there willing to collaborate on a book on the subject?

Martial arts [ 1 Answers ]

Which form of martial arts is most effective in strikeing with hands and teaches the student hand speed,accuracy, agility,and stress speed. If there is not such form of martial arts would the reader please tell me which form of martails arts would suit me best. Also would you tell me the best way...