CSCS CSCS: Biomechanics of Resistance 2

Question 1

What is the mechanical advantage of a muscle-joint system when the moment arm of the muscle force is shorter than the moment arm of the external load?

Accepted Answer

Less than 1.0

Answer

Mechanical advantage equals the ratio of the effort moment arm to the load moment arm; when the muscle arm is shorter, this ratio is less than 1.

Question 2

During a barbell back squat, which joint experiences the greatest compressive patellofemoral force at approximately 90° of knee flexion?

Accepted Answer

Patellofemoral joint

Answer

Patellofemoral compressive force peaks near 90° of knee flexion because quadriceps tension and knee contact area interact to maximize joint reaction force.

Question 3

The stretch-shortening cycle (SSC) enhances force production primarily because of energy stored in which tissue?

Accepted Answer

Elastic connective tissue (tendons and fascia)

Answer

During the eccentric phase, elastic energy is stored in tendons and fascia and subsequently released during the concentric phase to augment muscular force.

Question 4

If an athlete increases the velocity of a concentric muscle contraction, what generally happens to the force the muscle can produce?

Accepted Answer

Force decreases

Answer

According to the force–velocity relationship, concentric force output decreases as contraction velocity increases due to reduced cross-bridge cycling time.

Question 5

Which term describes the rotational effect produced by a force acting at a perpendicular distance from an axis of rotation?

Accepted Answer

Torque

Answer

Torque (moment of force) is defined as the product of force magnitude and its perpendicular moment arm distance from the axis of rotation.

Certified Strength and Conditioning Specialist Practice Test

Certified Strength and Conditioning Specialist Practice Test

CSCS CSCS: Biomechanics of Resistance 2