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Managing inertia
#1
Some thoughts about different bodies, thus different variable, when managing inertia. Feel free to share yours.

"Inertia is the resistance an object has to change in its state of motion or stasis." (relative motion, relative stasis) I recommend reading the very interesting exchange between Frey and Jari in the forum chapter "simple definitions"

What increases resistance:
(what I could gather from the AS book and the forum)

- more mass  (weight, heavy/light, heavier/lighter)
- more speed  (fast, faster)
- more stillness  (slow, slower)
- more length  (dimension, volume)  
- more liquidity  (lower tone)
- more rigidity  (higher town)
- more friction (surfaces, air, water, materials, clothes, shoes)
- proximity of a force to the fulcrum  (radius, rotational inertia, rotational momentum)


Different bodies are characterized by different volumes and masses regarding single body parts. 

Example:
- a long light arm 
- a long heavy arm
- a short heavy arm
- a short light arm

Mass and dimension are not necessarily proportional.
Mass and dimension seem to be constant variables. 
Variations and combinations are probably infinite. As well as the proportions between the single body units. 

More liquidity or rigidity can be achieved by engaging more or less muscle unites in isometric muscle contraction or inhibition of contraction. That allows also to bind or unbind body parts into larger or smaller unites. Consequently, increasing or decreasing the dimension, mass and muscular "tone" of the body unite that is moving. 

A long body or body unit will tip over, fall, swing, rotate around a fulcrum and accelerate slower than a short body or body unit. It will also require more force to overcome inertial resistance. However, once it overcomes its initial resistance to stasis and gets going, the longer body or body unit will produce more kinetic energy, even if is has the same mass as a shorter object. Rotational kinetic energy is proportional to the radius. 

Shifting the fulcrum of rotation nearer towards the center of gravity of a body or a body unit, decreases inertial resistance. 

The body is a very complex example, as when we move we have to manage a multitude of combinations of rotational end translational momentum at the same time. 

Gradually accelerating. 
Anticipating deceleration. 
A small force applied for a long time can produce the same change in momentum as a large force applied briefly. 

Lowering the center of gravity can help gaining stability.
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