AK Biomechanics & Body Movement Analysis 2

Question 1

Which type of lever is present at the ankle joint during plantar flexion (gastrocnemius lifting the heel)?

Accepted Answer

Second-class lever

Answer

The ankle in plantar flexion is a second-class lever because the load (body weight at the ball of the foot) lies between the fulcrum (metatarsophalangeal joints) and the effort (calf muscles at the calcaneus).

Question 2

When analyzing gait, which plane primarily describes the forward progression of the body?

Accepted Answer

Sagittal plane

Answer

The sagittal plane divides the body into left and right halves and contains the flexion/extension movements that drive forward locomotion.

Question 3

A patient demonstrates excessive lateral trunk lean toward the stance limb during walking. Which muscle weakness is most likely responsible?

Accepted Answer

Gluteus medius

Answer

Weakness of the gluteus medius causes a Trendelenburg gait where the trunk leans toward the weak side to keep the center of mass over the support limb.

Question 4

The term 'valgus' at the knee describes which positional deviation?

Accepted Answer

Distal segment angled medially (knock-kneed)

Answer

Valgus means the distal bone angles toward the midline, producing a knock-kneed appearance where the knees converge medially.

Question 5

Which concept in biomechanics describes the resistance of an object to a change in its rotational motion?

Accepted Answer

Moment of inertia

Answer

Moment of inertia quantifies how mass distribution relative to the axis of rotation resists angular acceleration or deceleration.

(AK) Certified Applied Kinesiologist Practice Test

(AK) Certified Applied Kinesiologist Practice Test

AK Biomechanics & Body Movement Analysis 2