Biomechanics – Numerical Final Exam Review

Set of flashcards covering key calculations and concepts from biomechanics relating to muscle and joint forces.

Erector spinae muscle force

The force required to maintain equilibrium when a load is applied, calculated to be approximately 3220 N for a 20 kg load.

X-component of the reaction force

The horizontal component of the reaction force, calculated to be approximately 3060 N when the muscle force is 3220 N at an angle of 72°.

Y-component of the reaction force

The vertical component of the reaction force, found to be approximately 1671 N under the same conditions as the X-component.

Magnitude of the reaction force

The total force acting on the vertebra, calculated to be approximately 3490 N from given X and Y components.

Hip joint force

The force at the hip joint in a limp condition, calculated as 1.28 times the weight (W).

Biceps pulling force

The force exerted by the biceps when lifting a mass of 14 kg at a forearm flexion angle of 72.6°, calculated to be approximately 1440 N.

Horizontal component of the reaction force at the elbow joint

The horizontal reaction force calculated to be approximately 430 N.

Vertical component of the reaction force at the elbow joint

The vertical reaction force found to be approximately 1240 N.

Magnitude of the reaction force at the elbow joint

The total reaction force at the elbow joint calculated to be approximately 1320 N.

Angle of the reaction force

The angle of the reaction force with respect to the horizontal, calculated to be approximately 70.9°.