Biomechanics Exam 1 Flashcards
What is Biomechanics?
The study of physics applied to living organisms
What is Kinetics?
The study of forces
What is Kinematics?
The study of motion
What is a force?
A push or pull on an object
Internal vs. External Forces
Internal force are created inside the body of interest and External forces are created outside of the body of interest
What are 2 External Forces?
Weight and Friction
What is gravity?
A force that draws objects towards its center
What is Friction?
Force that resists the sliding of two objects
What does it mean if a body is dynamic?
It means that the body is moving; this either means there is an increase/decrease in speed or change in direction.
What does it mean if a body is static?
It means that body is not moving, it’s sum of forces equals zero; no acceleration
What is Stress/Pressure?
F/A force in a given area
What is strain?
the relative measure of the deformation of a body as a result of loading
Shear Definition
Sliding force
Compression definition
push together
Tension definition
pull apart
What is the difference in Mass and Weight?
Mass is the quantity of matter that never changes. Weight is the force exerted due to gravity.
What is center of gravity?
a hypothetical point around which the force of gravity appears to act
What is Newton’s First Law?
an object in motion stays in motion, an object at rest stays at rest unless acted on by an external force
What is Newton’s Second Law?
F=ma
What is Newton’s Third Law?
For every action, there is an opposite and equal reaction
What is a vector?
a measurement with magnitude and direction
What is a scalar?
a measurement of only magnitude, not direction
What is Wolff’s Law?
“Every change in the form and function of a bone or of their function alone is followed by certain definitive secondary alteration in their external confirmation, in accordance with mathematical laws”
or
Tissues adapt to levels of imposed stress.
