W9 - Centre of Gravity & Stability Flashcards
What has an influence on the gravitational force?
Distance from the centre of the earth
Where would there be LESS gravitational pull around the earth?
What type of sports would this benefit?
Equator
Shot put + long jump - those w. a flight phase.
What is the line of gravity?
Vertical line through the point at which the object would balance.
When might the centre of gravity move?
If the orientation of the body segments change.
What is the centre of gravity location influenced by?
Shape of body/object
Position of limbs
Distribution of mass
Will the centre of gravity always lie on the body?
NO
What did Dick Fosbury discover with high jump?
That the Fosbury flop method means the jumper can apply the same amount of force as the pre-Fosbury techniques but achieve a higher score due to the body being able to arch higher than the centre of mass to avoid the bar.
Can body movements change the flight path?
NO
What are you influenced by once in flight?
Your takeoff velocity
both the horizontal + vertical
Methods for determining the centre of gravity
Balance method
Suspension - not very suitable for humans
Reaction board
Define stability
Resistance to linear + angular acceleration.
a.k.a resistance to change
How is the line of gravity linked to stability?
Position of the line of gravity is relative to the limits of the base:
⬆️ distance = ⬆️ stability
i.e a wider stance = ⬆️ stability
How is stability linked to the height of the centre of gravity from the base?
Lower centre of gravity = ⬆️ stability
How is stability linked to the weight of the body?
Greater weight = ⬆️ stability
Due to greater resistance to change.
What tends to happen when the line of gravity of an object moves outside its base?
Object will tend to rotate
… in sport could lead to a fall
