L22 Flashcards
1
Q
COM
A
Centre of mass
-depends on the extremities for the human body
-changes with the placement of the body
2
Q
GRF
A
Ground reaction force
-acts through the body’s COM
3
Q
While running, if the COM of a person is behind the point of contact between the foot and the ground, what direction is the GRF resultant vector pointing?
A
Backwards
4
Q
Fosbury Technique
A
Raising the arms elevates the COM
5
Q
Com is important for: (2)
A
Stability: resistance to linear and or angular acceleration
Balance: ability to control equilibrium -in order to balance, the athletes COM must be located within the support base
6
Q
How to Improve Stability: (5)
A
- Increase body mass
- Increase friction between the body and contact surface
- Increase size of support base in the direction of the line of action of the external force
- Horizontally position COM near the edge of support base on the side of oncoming external force
- Vertically positioning COM as low as possible
7
Q
Pressure
A
Force per unit area
1 N met m2 is equal to 1 pascal
Pressure= Force (N) / Area
8
Q
Momentum
A
P = mass x velocity
-mass has to be in kg, velocity in m/s
