Stationary Positions (Lecture 5) Flashcards
Supports are a _________ position
Stationary
Supports?
- COM is near the middle of BOS
- High stability
Balances
- COM is near the edge of BOS
- Low stability
Hangs
- COM is below the BOS
- Very high stability
How to develop mechanical advantages?
- Altering BOS
- Altering COM
- Altering rigidity
What do all the stationary (static) skills in gymnastics have in common?
The body’s centre of mass remains within the body’s base of support
Definition #1 of centre of mass
The balance point of a body = its centre of mass
Definition #2 of centre of mass
The point about which all the body’s mass is equally distributed in all directions
Definition #3 of centre of mass (very useful for gymnastics coaches)
The point about which a body rotates when it is free in space
Definition #4 of centre of mass (also useful for gymnastics coaches)
The intersection of the 3 primary axes’
Is the centre of mass of an object in a fixed position?
No, it varies as the body mass distribution varies. Ex. Raising arms when standing shifts your mass upward, therefore centre of mass in shifted upward
What are the categories of stationary positions?
- supports
- balances
- hangs
What are the mechanical reasons for good form?
The tighter the body and the closer the body mass is to the rotational axis, the faster the body will spin, or salts, or cartwheel
The more rigid the body, the easier it will balance and the better it will SPRING. In these cases good form has biomechanical benefits which may or may not coincide with aesthetic values
