ATC Aquatic Kinesiology & Biomechanics

Question 1

According to Archimedes' principle, the buoyant force acting on an immersed object is equal to:

Accepted Answer

The weight of the water displaced by the object

Answer

Archimedes' principle states that the buoyant force equals the weight of the fluid displaced by the object, not its own weight.

Question 2

Which characteristic of water creates resistance to movement that increases with the square of the patient's velocity?

Accepted Answer

Drag force

Answer

Drag force is proportional to velocity squared (F ∝ v²), so doubling speed quadruples resistance, making velocity the most powerful progression variable in aquatic therapy.

Question 3

In the human body, the center of buoyancy is typically located in which region?

Accepted Answer

Upper chest and thorax

Answer

The center of buoyancy resides in the upper chest because the air-filled lungs make this region less dense, positioning it superior to the center of gravity.

Question 4

The average specific gravity of the human body is approximately 0.97. What is the primary clinical implication of this value?

Accepted Answer

Most patients can float because their density is slightly less than water

Answer

A specific gravity below 1.0 (water) means the body is less dense than water, allowing most individuals to float with minimal effort.

Question 5

According to Pascal's law, hydrostatic pressure in aquatic therapy increases proportionally with:

Accepted Answer

Depth of immersion

Answer

Hydrostatic pressure increases linearly with depth because the weight of the water column above a point grows as immersion deepens.

ATC - Aquatic Therapy Certification Practice Test

ATC - Aquatic Therapy Certification Practice Test

ATC Aquatic Kinesiology & Biomechanics