Equilibrium and Human Movement

The flashcards cover key concepts from the lecture on equilibrium and human movement, including definitions of torque, moment arm, center of gravity, mechanical advantage, and lever classifications.

Torque

The rotary effect of a force about an axis of rotation.

Moment Arm

The perpendicular distance between a force's line of action and the axis of rotation.

Center of Gravity (CG)

The point around which the mass and weight of a body are balanced.

Mechanical Advantage

The ratio of the moment arm of the force to the moment arm of the resistance.

Static Equilibrium

A motionless state in which there is no net force or net torque acting.

First-class lever

A lever where the fulcrum is located between the applied force and the resistance.

Second-class lever

A lever where the resistance is located between the fulcrum and the applied force.

Third-class lever

A lever where the applied force is located between the fulcrum and the resistance.

Agonist

The muscle that creates velocity of movement.

Antagonist

The muscle that controls velocity of movement and enhances stability.

Dynamic Equilibrium

A state indicating a balance between applied forces and inertial forces for a body in motion.

Base of Support

The area bound by the outermost regions of contact between a body and the support surface.

Dislocating Component

The force component parallel to the attached bone that tends to dislocate the joint.

Rotary Component

The force component perpendicular to the attached bone that produces torque.