STability Chapter 3 Movement Principles can be applied to a variety of movements to improve performance Sir Isaac Newtons 3 Laws of Motion inertia An object at rest stays at rest and an object in motion ID: 621287
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Slide1
Principles of Motion and STability
Chapter 3 Slide2
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. Slide3
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 contactSlide4
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.Slide5
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).Slide6
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 elementsBreak 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