Biometrics

What are the three lenses of studying human movement?

Mechanical, Coordination and Control, Learning.

Define vectors and provide an example.

Vectors have both magnitude and direction, e.g., velocity.

What is the formula for vector addition when two vectors are at an angle?

Pythagorean theorem.

What are the parameters determining projectile motion?

Speed, angle, and height.

How does increasing projection speed affect projectile distance?

It increases the horizontal distance traveled.

What are Newton's three laws of motion?

1. Law of Inertia, 2. Law of Acceleration, 3. Law of Action-Reaction.

What does the impulse-momentum relationship state?

Impulse applied to an object is equal to the change in its momentum.

How does moment of inertia relate to an object's ability to spin?

Low inertia means it is very likely to rotate; high inertia means it is less likely to rotate.

What is the significance of center of gravity (CoG) in stability?

The CoG must be within the base of support for stability.

What is the definition of motor learning?

Practice or experience leading to permanent gains in the capability for skilled performance.

Describe the 3 stages of motor learning.

Cognitive, Associative, Autonomous.

What is Fitts' Law?

As the speed of a movement increases, accuracy diminishes.

What is the advantage of closed-loop control?

Flexibility in movement control adapting to changes in the environment.

What is intrinsic feedback?

Natural consequences of making an action.

What is the primary benefit of variable practice?

Better generalization through exposure to a wider range of conditions.

What is the effect of massed practice compared to distributed practice?

Distributed practice is more effective due to longer rest periods.

What does Hick’s law imply about reaction time?

As the number of alternatives increase, reaction time increases.

What is the effect of projection angle on projectile motion?

It depends on speed and height; a specific optimal angle is affected by air resistance.

Define open-loop control.

Actions are organized ahead of time without feedback.

What is feedback dependence in learning?

Too much feedback can lead to dependency and hinder learning.

How does the degree of freedom problem relate to motor control?

It concerns how to control movements with multiple joints and dimensions.

Explain the term 'synergies' in the context of motor coordination.

Expert coordination of body movements to maintain effectiveness while aiming.

What does the term 'temporal accuracy' refer to?

The accuracy of timing in movements, improving with increased speed.