Exam 2: Motion & Stability Flashcards
Why it is important for educators to know and understand the relationship between motion and stability?
It’s critical to identifying skilled from unskilled movements
Why should we understand the basic biomechanical principles?
Because we talk about them in motor development.
Why do infants/children choose the most efficient movement pattern based on structural and task constraints? What are some examples?
Because they will always choose the path of least resistance.
Ex. a child walking a certain way because that’s what’s easiest for them.
Newton’s 1st Law
Define Newton’s 1st law.
An object at rest stays at rest and an object in motion stays in motion until acted upon by a force.
Newton’s 1st Law
Define inertia & momentum
Inertia: resistance to motion related to mass
Momentum: the product of mass and velocity
Newton’s 1st Law
Why should we care about these concepts when teaching children new skills?
Because we need to give them implements that are apppropraitely sized. They need more momentum to get an object where they want it to go.
Newton’s 2nd law
What important concepts can we take away from this specific law?
To move an object farther or faster:
1. Increase force delivered to object
2. Increase the distance over which force is applied
Newton’s 2nd Law
How would an educator use it in their daily practice?
IDK…
Newton’s 3rd law
Define it. What are the implications of Newton’s 3rd Law?
- To every action, there is an equal and opposite reaction
- Any forces you apply outside of the plane of motion that is desired = undesired reaction force
- Skilled movers avoid rotational movements
Newton’s 3rd Law
How would this impact a skilled vs. unskilled mover?
An unskilled mover is going to have more undesired reaction forces.
Force Absorption
What is it and why is it important to understand?
To absorb forces when making an object stop:
1. Increase time over which force is applied
2. Increase surface area absorbing the force
It’s important because younger kids aren’t going to be able to absorb force as well
Force Absorption
What could a child do to increase their force absorption during a task?
Bend their knees
Stability and Balance
Explain the difference between the two. What is the stability-mobility trade-off?
Stability: resistance to motion
Balance: ability to maintain equilibrium
Throughought life, our body will go through delicate balance of do I need more motion or stability?
How can we increase our stability?
- Increase base of support
- Lower center of gravity
How can we increase our balance?
- Increase stability
- Increase strength, coordination, & proprioception
