Chapter 3 Flashcards
What are changes based on? (Skill development)
Based on optimizing bio mechanical principles of mite in and stability over time
What is Newton’s First law?
An object at rest stays at rest and an object in motion stays in motion until acted upon by a force
What is inertia?
Resistance to motion related to mass
What is momentum?
Is the product of mass and velocity
Child learns to swing a bat: What must the child learn about inertia?
The heavier the object, the more force needed to move the object
Child learns to swing a bat: What must the child learn about momentum?
Faster the swing, more momentum
What is Newton’s Second Law?
The acceleration of an object is proportional to the force applied and inversely proportional to its mass
What is the equation for force
F = m x a
How would you move an object farther/ faster
- Start running from further
- Have a larger back swing
- get a larger surface area to kick
What is Newton’s Third Law
To every action, there is an equal and opposite reaction
What is an open kinetic chain?
It is a correctly timed sequence of movements to correctly perform a skill
- correct timing and correct sequence
What are some examples of an open kinetic chain (in sports)
- long jump (not stopping before the board)
- Soccer (running up to the ball, stopping before kicking it)
What is stability?
The ability to resist movement
How do you increase stability?
- increase base of support
- lower centre of gravity
What is balance?
The ability to maintain equilibrium
How do you increase balance?
- increase stability
- Improve strength, coordination and proprioception
What is the stability-mobility trade-off
Increased stability leads to increased balance, but less mobility
