Biomechanics of Specific Movements: Enhance Your Understanding

Question 1

How do biarticular muscles contribute to joint stability? Provide specific examples to illustrate their function.

Accepted Answer

Biarticular muscles span two joints, allowing them to control and stabilize both joints simultaneously.

Answer

Biarticular muscles are weaker than monoarticular muscles, making them less effective in stabilizing joints.

Answer

Biarticular muscles are only found in the lower limbs, such as the hamstrings.

Answer

Biarticular muscles do not contribute to joint stability, as their actions are primarily focused on movement.

Question 2

Which of the following is NOT a fundamental principle of biomechanics?

Accepted Answer

The body is a closed system.

Answer

Force equals mass times acceleration.

Answer

Energy can neither be created nor destroyed, only transformed.

Answer

The body is a lever system.

Question 3

The moment of inertia of an object is primarily influenced by:

Accepted Answer

Mass, distance from the axis of rotation, and object shape.

Answer

Object shape and distance from the axis of rotation only.

Answer

Mass and distance from the axis of rotation only.

Question 4

Which of the following muscles is the primary mover for dorsiflexion of the foot?

Accepted Answer

Tibialis anterior.

Answer

Soleus.

Answer

Gastrocnemius.

Answer

Peroneus longus.

Question 5

What is the main function of the patellar ligament?

Accepted Answer

To connect the patella to the tibia and stabilize the knee joint.

Answer

To extend the knee joint.

Answer

To flex the knee joint.

Question 6

In the field of biomechanics, what is the distinction between kinematics and kinetics?

Accepted Answer

Kinematics analyzes body motion, while kinetics examines the forces acting on the body.

Answer

Both kinematics and kinetics analyze body motion.

Answer

Kinematics examines the forces acting on the body, while kinetics analyzes body motion.

Question 7

Regarding running techniques, which approach aims to minimize vertical oscillation and maximize forward propulsion?

Accepted Answer

Midfoot strike

Answer

Toe strike

Answer

Flat-footed strike

Answer

Heel strike

Question 8

During a vertical jump, the primary muscles that generate upward force are:

Accepted Answer

Quadriceps and gastrocnemius

Answer

Gluteus maximus and soleus

Answer

Hamstrings and tibialis anterior

Answer

Calves and hamstrings

Question 9

For a projectile launched with the goal of maximizing horizontal distance, which factor is most crucial in determining the optimal release angle?

Accepted Answer

Projectile velocity

Answer

Height of release point

Answer

Wind speed

Answer

Air resistance

Question 10

In biomechanical analysis, which technique involves attaching reflective markers to body segments to capture accurate motion data?

Accepted Answer

Motion capture

Answer

High-speed cinematography

Answer

Electromyography

Answer

Force plate analysis

Question 11

In a squat exercise, the joint action primarily responsible for the eccentric loading phase is:

Accepted Answer

Knee flexion

Answer

Hip extension

Answer

Ankle plantarflexion

Answer

Trunk flexion

Question 12

In analyzing a golf swing, moment of inertia refers to the:

Accepted Answer

Resistance of the club to angular acceleration

Answer

Trajectory of the ball

Answer

Speed of the clubhead

Answer

Force applied to the club

Question 13

The primary determinant of force output during isometric contractions is:

Accepted Answer

Cross-sectional area of the contracting muscle

Answer

Length of the muscle

Answer

Muscle fiber type recruited

Answer

Speed of muscle contraction

Question 14

In a running stride, the instant at which ground reaction force reaches its peak value is known as:

Accepted Answer

Mid-stance

Answer

Flight phase

Answer

Foot strike

Answer

Toe-off

Question 15

Which type of joint motion occurs when the angle between two bones decreases?

Accepted Answer

Flexion

Answer

Extension

Answer

Adduction

Answer

Abduction

Question 16

The center of mass is the point at which:

Accepted Answer

The total mass of the body can be considered concentrated without altering its rotational characteristics

Answer

Weight is evenly distributed

Question 17

Which of the following is NOT a factor that influences muscle power output?

Accepted Answer

Muscle endurance

Answer

Muscle force

Answer

Muscle velocity

Question 18

In the analysis of jumping, the term 'contact time' refers to:

Accepted Answer

The duration that the feet are in contact with the ground

Answer

The time spent in the flight phase

Answer

The time needed to reach peak height

Question 19

Which of the following is a primary function of the Achilles tendon?

Accepted Answer

Transmit the force from the gastrocnemius and soleus muscles to the calcaneus

Answer

Cushion the heel

Answer

Stabilize the ankle joint

Question 20

Which of the following is a potential cause of delayed-onset muscle soreness (DOMS)?

Accepted Answer

Microscopic tears in muscle fibers

Answer

Electrolyte imbalance

Answer

Low blood sugar

Answer

Dehydration

Question 21

In biomechanics, the term 'moment of inertia' refers to:

Accepted Answer

The resistance of a body to changes in its rotational motion

Answer

The force exerted on a body about a fixed axis

Answer

The work done by a force over a distance

Question 22

The optimal release point for a javelin throw is when the:

Accepted Answer

Angle of the javelin is parallel to the ground

Answer

Javelin is at its highest point

Answer

Thrower is at their maximum velocity