Chapter 3 Flashcards
Motion & Stability
The physical and mechanical principles under which humans move
Newton’s first law of motion
-WHAT STOPS THIS?
An object at rest stays at rest, or an object at motion stays at motion
-IF THE OBJECT IS ACTED UPON BY FORCE
Inertia
-how heavy an object is related to how much resistance it has to motion
If an object is:
- HEAVY & FAST?
- LIGHT & SLOW?
- HIGH INERTIA
- LOW INERTIA
Newton’s second law of motion
The acceleration of a person or object is proportional to the force applied to it and inversely proportional to its mass
Newton’s third law of motion
Action - Reaction
For every force you exert on an object, the object exerts an equal force back on you in the opposite direction
Rotational movement
Individuals move when limbs rotate around one or several joints
Linear velocity
Linear velocity = rotational velocity and its radius of rotation
Open kinetic chain
Correctly timed sequence of movements an individual uses to successfully perform a skill
Force absorption
To decrease the impact of a reaction force, you must either increase the time in which the impact occurs or increase the area over which the impact occurs
Balance
The ability of an object or person to maintain equilibrium
Stability
The ability of an object or person to resist movement
What is the stability-mobility trade-off?
If your are super stable, then you won’t be very mobile AND vice versa
How can one increase stability?
- Increase base of support
- Lower center of gravity
How can one increase balance?
- Increase stability
- Improve strength, coordination, and proprioception
