Biomechanics Flashcards
Biomechanics
Principles of forces and motion as applied to the structure and funciton of the human body
Static
Factors associated with non moving systems
Dynamics
Factors associated with moving systems
Law of inertia
An object at rest tends to stay at rest, and an object in motion tends to stay in motion
- force is needed to move, stop, or change the direction of an object
Law of acceleration
Amount of acceleration depends on the strength of the force applied to an object
- the change in an object’s direction depends on the force applied
- acceleration is inversely proportional to the mass of the object
Law of motion
For every action, there is an equal and opposite reaction
Force
Any influence that results in the movement of an object
- point of application
- vector
Vector
A quantity that describes magnitude and direction
Internal force
Muscle, ligamentos restraint, bony support
External force
Gravity, weight, friction
Linear force
Two or more forces activing along the same line
Parallel forces
Occur in the same plane and in the same or opposite direction
Concurrent forces
Two or more forces applied to the same point but pulling in different directions
- resultnat force is dependent on angles of pull and magnitude
Force couple
Two or more forces acting in equal but opposite directions to facilitate a rotation
Torque
A force that causes a rotation about an axis
- increases as the force applied increases or the distance from the axis increases
Torque = force x distance
