NSCA-CPT Biomechanics 3

Question 1

What does the term 'moment arm' refer to in biomechanics?

Accepted Answer

The perpendicular distance from the line of force to the axis of rotation

Answer

The moment arm is the shortest (perpendicular) distance between the axis of rotation and the line of action of the applied force.

Question 2

Which axis of rotation is associated with transverse plane movements?

Accepted Answer

Vertical (longitudinal) axis

Answer

Transverse plane movements such as rotation occur around the vertical (longitudinal) axis running head to toe.

Question 3

An increase in base of support (BOS) typically results in:

Accepted Answer

Increased stability

Answer

A wider BOS lowers the likelihood that the center of gravity will move outside the support base, increasing stability.

Question 4

During a push-up, which joint action occurs at the shoulder during the upward phase?

Accepted Answer

Horizontal adduction

Answer

The upward phase of a push-up involves horizontal adduction (pressing the arms together in the transverse plane) at the glenohumeral joint.

Question 5

Newton's third law states that for every action there is:

Accepted Answer

An equal and opposite reaction

Answer

Newton's third law (law of reaction) states that forces come in pairs: equal in magnitude but opposite in direction.

NSCA-CPT Exam Practice Test