Lecture 3

Question 1

Calibrating movements to achieve a ____ in a _____ requires some (____ or ____) knowledge of _____ _____.

Answer 1

• task
• environment
• implicit or explicit
• physical mechanics

Question 2

During development, change in ____:_____ constraints and the interaction with things like ______ are important limiters of motor patterns.

Answer 2

• individual: structural

- gravity

Question 3

Newton’s First law:

Answer 3

• an object at rest stays at rest and an object in motion stays in motion until acted upon by a force
• inertia is resistance to motion related to mass
• momentum is the product of mass and velocity

Question 4

Newton’s first law states that we must exert force to:

Answer 4

• move objects

- move ourselves

Question 5

Newton’s first law states that more inertia means that:

Answer 5

• it is harder to move

- more force application is required

Question 6

To move an object farther or faster, you must:

Answer 6

• increase force

- increase distance over which force is applied

Question 7

What are 2 ways we can add distance to improve a kick?

Answer 7

• increase step length (linear distance)

- increase ROM (rotational distance)

Question 8

Newton’s second law:

Answer 8

• object’s force is related to mass and acceleration (F = ma)
• object’s acceleration is related to force applied and inversely related to mass (a = F/m)

Question 9

Newton’s third law:

Answer 9

to every action there is an equal and opposite reaction

Question 10

How is Newton’s third law used?

Answer 10

oppositional movements and directional force

Question 11

Give examples of oppositional movements.

Answer 11

• oppositional arms and legs movement in running

- running: push down on floor and floor pushes back up

Question 12

What does exerting force in primary movement plane mean?

Answer 12

• use force in the plane of motion which you want to move yourself or an object
• avoid rotational movements that reduce force in the desired plane

Question 13

How can we increase velocity in rotating limbs and projected objects?

Answer 13

• increase rotational velocity (swing it faster)

- increase relative length (fully extend it at release or contact)

Question 14

Why not keep the limb extended throughout a rotational motion?

Answer 14

leg would have too much rotational inertia

Question 15

Stability:

Answer 15

ability to resist movement

Question 16

Balance:

Answer 16

ability to maintain equilibrium

Question 17

The more ____ you get, the less _____ you become.

Answer 17

• stability

- mobile