Stability Flashcards
3 important terms to understand are ________, equilibrium and stability
-balance
mass is the ________ of matter of which the body is _______ (kg), while ______ is the measure of force which which the earth pulls the body’s mass (Newtons)
- quantity
- composed
- weight
The _____ _ _______ (CoG), is the point of the body through which gravity acts, the _______ _____ or the point where weight seems concentrated
- Centre of gravity
- balance
CoG is also called the ___ _ _____ and doesn’t have to be within the ______ _______ of a body
- Centre of Mass
- physical substance
each body segment has its own ___, _____ and CoG, w which is usually closer to the _______ end
- mass
- weight
- proximal
The _______ of the CoG depends on the _____ and arrangement of body segments,
- location
- position
________ segments of the body have a greater influence on the location of the CoG than _____ segments
- more massive
- smaller
typically, ___ have a higher CoG than _____
- men
- women
the Line of CoG in the line of ____ of the force of ______
- action
- gravity
______ is a turning or rotary force that is ‘off centre’ and describes how this force effects a body. It is also known as a _______
- Torque
- moment
Torque is calculated by multiplying the _____ by the distance from the line of gravity
-force
CoG is calculated by 4 different methods; suspension, _______, balance board and ________
- segmentation
- reaction board
The ________________ is the area defined by straight lines connecting the most outer body parts that are touching the supporting surface
- base of support
eg: two feet and one hand would make a triangle. It is inclusive of the space in between
_____________ is defined by having 0 acceleration
-equilibrium
Balance is the ability to control _________
-equilibrium
________ is resistance to disturbance of equilibrium
-stability
Equilibrium is unchanged in speed and direction and comes in 2 types: __________ and _________
- dynamic
- static
Static ________ occurs when a body is at rest, not __________ or rotating
- equilibrium
- translating
__________ equilibrium is when a body is moving with _______ speed and direction
- dynamic
- constant
Equilibrium can also be stable (triangle on large base), _______ (triangle on tip)or neutral (like a sphere shape)
-unstable
Balance is _______ the body’s equilibrium for a given purpose
-controlling
Stability is the _______ which which equilibrium can be _______
- difficulty
- disturbed
Stability can be one of 4 types: dynamic, ________, linear or ______
- enduring
- rotary
Stability is affected by several things:
- _______ of the body
- position of LoG relative to limits of BoS
- _______ of BoS
- height of CoG relative to BoS
- principle of ______
- weight
- width
- moments
Principle 1 states that for a given stance, stability is proportional to the _____ of the body. e.g. heavier = more stable
-mass
Principle 2 states that a body is more stable when the LoG falls _________ _______ the BoS. Stability is lost when LoG falls _______ of the BoS
- well within
- outside
Principle 3 states that stability against a force from a given _______ is proportional to the ______, in that direction, from the point at which the LoG falls to the edge of the BoS Eg, the boys pushing, dog resisting
- direction
- distance
Principle 4 states that if stability is the primary consideration, the CoG should be kept as ____ as possible
-low
__________ stability is being ready to move quickly off the mark. So, you would want a _____ CoG, a narrow ______, to move the CoG to the edge of the BoS and to minimise body _____. Eg: sprinters
- dynamic
- high
- BoS
- weight
___________ stability is staying still and stable easily. So you’d want a ______ CoG, a centred LoG within the BoS, a ______ BoS and maximised body weight
- enduring
- low
- wide
