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Principles of Motion and STability

Principles of Motion and STability. Chapter 3 . Movement Principles can be applied to a variety of movements to improve performance. Sir Isaac Newton’s 3 Laws of Motion (inertia) An object at rest stays at rest , and an object in motion stays in motion unless acted upon by another force

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Principles of Motion and STability

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  1. Principles of Motion and STability Chapter 3

  2. Movement Principles can be applied to a variety of movements to improve performance • Sir Isaac Newton’s 3 Laws of Motion • (inertia) An object at rest stays at rest, and an object in motion stays in motion unless acted upon by another force • The amt. of acceleration an object has when you apply a force to it is proportional to the amount of force applied and inversely proportional to its MASS, • For every action there is an equal and opposite reaction.e.g. pushing off floor during walking – push down and back, you go forward and up Infants push more down than back and move slower as a result.

  3. Movement principles • Rotational force to linear force The objects linear velocity= rotational velocity and radius of rotation (thus a longer arm = greater force production) Shorter limb length = less resistance to motion Thus to produce a quick throw you need a compact motion To produce the greatest force you need a long motion. (e.g. javelin vs baseball) Ice skater Batter compact swing to start, full extension on contact

  4. Kinetic Chain – involvement of various muscles and body parts in a timed sequence to maximize force production. e.g. – throwing, batting, tennis serve, etc. • Force Absorption – the impact of a force is affected by the time over which the impact occurs and the area that the impact effects. • Knees bending decreases impact of jump • Knees straight increase impact of jump • “Giving” with ball • “Giving” with collision ---Stability= resistance to movement (large heavy box) --Balance= the ability to maintain equilibrium (equal distribution of wt.) around the Center of Gravity (CG) --Larger the base of support(BOS)=greater balance and stability --Balance = CG being over the base of support --The lower the CG is to the BOS, the more stable one is.

  5. In Locomotor Skills --You sacrifice stability in order to move --Alternating losing and gaining balance from one foot to the other --CG is pushed out over the BOS, and then the individual quickly moves his other leg forward to regain balance (dynamic balance).

  6. Website Document (Movement Principles) • Using Principles to Detect and Correct Errors • Complete and full observance of the movement (technology) • Analyze each phase and its key elements • Break it down into parts (kinetic chain) • Use movement principles to analyze the movement • Can you improve stability? • Kinetic chain sequence? • Release Point? • Correct errors through isolation and repetition

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