ATC Aquatic Kinesiology & Biomechanics 2

Question 1

In aquatic biomechanics, the 'metacentric couple' refers to the rotational tendency created by:

Accepted Answer

The offset between the center of gravity and center of buoyancy

Answer

The metacentric couple is the rotational force pair produced when the center of gravity and center of buoyancy are not vertically aligned, tending to rotate the body.

Question 2

When a therapist instructs a patient to 'streamline' a limb by moving the hand blade-first through water, which type of drag is primarily reduced?

Accepted Answer

Form drag

Answer

Form drag (pressure drag) is reduced by streamlining because presenting a narrower cross-section to the direction of movement decreases the pressure differential across the limb.

Question 3

Metacentric height in aquatic biomechanics is best defined as:

Accepted Answer

The vertical distance between the metacenter and the center of gravity, indicating rotational stability

Answer

Metacentric height measures the distance between the metacenter and center of gravity; a positive value indicates the body will self-correct rotational displacement, while a negative value indicates instability.

Question 4

Turbulent flow conditions created during aquatic therapy are most clinically valuable for:

Accepted Answer

Increasing resistance and balance challenge through unpredictable forces

Answer

Turbulent flow creates multidirectional, unpredictable resistance forces that challenge proprioception and balance, making it therapeutically useful for neuromuscular training.

Question 5

The concept of 'added mass' in aquatic biomechanics is most accurately described as:

Accepted Answer

The mass of surrounding water that must be accelerated along with a moving body segment

Answer

Added mass (virtual mass) is the volume of water entrained by a moving limb that must be accelerated together with the limb, increasing the effective inertia of the movement.

ATC - Aquatic Therapy Certification Practice Test

ATC - Aquatic Therapy Certification Practice Test

ATC Aquatic Kinesiology & Biomechanics 2