Recent content by matb

  1. M

    Variable acceleration/velocity of an arm in motion

    A table tennis stroke is a swing, and there is a delay in transmission of hip motion to arm motion in that instance. Furthermore, there is a body weight component that enables you to transmit force through the joints to the arm. TBH, rather than a debate on whether or not the arm continues to...
  2. M

    Calculating Rotational Force on Knee Joints for Karate Stances

    Oh my goodness! I didn't realize it was that complicated. Is it not possible to use a greatly simplfied model that assumes a simple hinge joint and evenly distributed connecting tissues spread across its width? In the first instance, I'm simply trying to work out the increase in stress on...
  3. M

    Pivots and rotational velocity

    Oh I think just a very simplistic level of accuracy will be more than adequate for exploring the principles in the grossest sense. I'm really looking for a basic understanding about the transmission of force down the various joints. I've heard about various styles that are created around a...
  4. M

    Pivots and rotational velocity

    I'm trying to work out the science of a simplified model of the human body, and I would appreciate your help on some of the basic formulae. If I have a bar (representing the shoulders), which has a central pivot point, connected by a unrestricted hinge to a rod (representing the upper arm...
  5. M

    Model for the physics of motion

    Using simplified models for the muscles, ligaments, and cartileges, do you think that it's feasible to construct a scientific model for all of the interactions of motion that occur in the human body in order to calculate optimal transmission of force whilst moving, striking, and evading...
  6. M

    Calculating Rotational Force on Knee Joints for Karate Stances

    I'm trying to calculate the stress placed upon knee joints by low karate stances. If I assume a body weight of 200 pounds, with a shin length of 18 inches and a thigh length of 24 inches, how can I calculate the force placed upon the knee joint when the thigh is: verticle above the shin...
  7. M

    Variable acceleration/velocity of an arm in motion

    I'm a karate instructor desperately trying to find a model or formula that explains what happens to the to speed and acceleration of a limb under varying conditions. If you assume that a limb has a travel distance of 3 feet, moving from stationary, and the limb weighs 5 kilos. If I assume...
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