Chapter 3: principles of motion Flashcards
1
Q
Newtons 2nd law:
A
Acceleration is proportional to force applied
2
Q
Newtons 3rd law
A
Every action has a reaction
3
Q
Rotational movement:
A
When projecting an object limb traces a part of a circle
- increase limb length results in increase velocity
- increased extension of limb will result in increase of radius and velocity
4
Q
Inertia:
A
Resistance to motion
- depends on mass and limb length
Increase limb length=increase inertia
5
Q
Open Kinetic chain:
A
Correctly timed sequence of movement
6
Q
Force absorption
A
Decrease force by bending limbs
Decrease force by increasing time and area
7
Q
Stability and balance
A
Stability: resists motion
Balance: maintains equilibrium
Achieve stability through wide base and low CoG
8
Q
Steps to using principles of motion (5)
A
- OBSERVE full movement
- ANALYZE each phase and key element
- use KNOWLEDGE
- Select ERROR
- Select METHOD of correction
9
Q
Newton’s first law:
A
Object at rest will remain until acted on by a force
