Chapter 8 Flashcards
(22 cards)
The study of forces and the motions produced by their actions related to structure and function of the human body
Biomechanics
Factors associated with non-moving or nearly non-moving systems
Statics
Factors associated with moving systems
Dynamics
Deals with force causing movements
Kinetics
Relates to the time, space and mass aspects of movement
Kinematics
Refers to how bones move in space. Aka physiologic motion. (flexion/extension, ab-adduction)
Osteokinematics
Adjoining joint surfaces move in relation to each other during osteokinematic movement (roll,slide, spin)
Arthrokinematics
Push or pull action
Force
A quantity having both magnitude and direction
Vector
A vector that describes speed and is measured in units such as feet per seconds or miles per hour
Velocity
This quantity describes only magnitude
Scalar
The amount of matter that a body contains
Mass
The property of matter that causes it to resist any change of its motion in either speed or direction.
Inertia
The tendency of force to produce rotation around an axis
Torque
A force developed by two surfaces, which tends to prevent motion of one surface across another
Friction
Newton’s first law. An object at rest, stays at rest and an object in motion stays in motion
Law of inertia
Any change in the velocity of an object.
Acceleration
The amount of acceleration depends on the strength of the force applied to an object
Law of acceleration
For every action there is an equal and opposite reaction
Law of action- reaction
Two or more forces are acting along the same line.
Linear force
Occur in the same plane and in the same or opposite direction
Parallel force
Two or more forces must act on a common point but must pull or push in different directions.
Concurrent forces
