Basics and Terminology Flashcards
The study of FORCES and their effects.
Mechanics
Branches of mechanics that deals with the geometry of the MOTION OF OBJECTS (inc. Displacement, acceleration, velocity).
Kinematics
The study of RELATIONSHIPS between the FORCE system acting on the body and the changes it produces in BODY MOTION.
Kinetics
Uses principles of mechanics for SOLVING PROBLEMS related to structure and function of biologic and physiologic systems.
Biomechanics
What is the objective of learning biomechanics?
To understand the loading condition of tissues and their mechanical responses.
Scalars are ______only.
magnitude
Vectors are _____ and _____.
Magnitude and direction
Examples of scalars are?
Distance, speed, mass
Examples of vectors are? 6
Displacement, velocity, acceleration, weight, momentum, force
Vectors are represented graphically by what?
arrows
Distance is a ____ quantitidy.
scalar
Displacement is a ____ quantity.
vector
How much a ground object has covered during it’s motion.
distance
How far out of place and object is, overall change in position.
displacement
In what circumstances are displacement and direction the same?
If moving in one direction in a straight line.
In what circumstance are displacement and direction different?
If the path of travel is not a straight line.
Speed is a ____ quantity.
scalar
Velocity is a ____ quantity.
vector
How fast and object is moving?
speed
Speed equation?
Distance over time.
The rate at which an object changes position.
velocity
Velocity equation?
Displacement over time.
The maximize velocity, must maximize what?
Amount displaced from original position.
The rate at which an object changes its velocity.
acceleration
Equation for acceleration:
change in velocity over time.
T/F If an object is not changing it’s velocity, then the object is not accelerating?
true
Can a person be moving very face and still not be changing velocity?
yes
Acceleration has to do with _______ ?
Changing how fast and object is moving.
Acceleration is a _____ quantity.
vector
The direction of the acceleration vector depends on what two things?
1 - whether object is speeding up or slowing down.
2- Whether the object is moving in the + or - direction.
Mass is a ____ quantity.
scalar
Weight is a ____ quantity.
vector
Determined by the amount of matter that is contained by the object. (How much stuff is in the object)
mass
The force of gravity acting on an object. (the force with which gravity pulls upon that stuff).
weight
A 1kg mass is how many newtons? How many pounds?
10 Newton =
2.2 Pounds
= 1 kg
Gravitational distance changes when?
When the distance between their centers change.
Momentum is a ___ quantity.
vector
“Mass in motion” - quantity of motion an object possesses.
momentum
Momentum (p) =
Mass x velocity
Will something that has a lot of momentum be easier to stop?
no
If the object is heavier will it have less momentum?
No, it will have more!
If you double the mass, what happens to the momentum?
It doubles!!
If you quadruple the velocity, what happens to the momentum?
Quadruples
A small change in momentum variable means what?
A big change in momentum
How does momentum translate of chiropractic?
High velocity = greater momentum
