Flashcards in Basics and Terminology Deck (45):
The study of FORCES and their effects.
Branches of mechanics that deals with the geometry of the MOTION OF OBJECTS (inc. Displacement, acceleration, velocity).
The study of RELATIONSHIPS between the FORCE system acting on the body and the changes it produces in BODY MOTION.
Uses principles of mechanics for SOLVING PROBLEMS related to structure and function of biologic and physiologic systems.
What is the objective of learning biomechanics?
To understand the loading condition of tissues and their mechanical responses.
Scalars are ______only.
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?
Distance is a ____ quantitidy.
Displacement is a ____ quantity.
How much a ground object has covered during it's motion.
How far out of place and object is, overall change in position.
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.
Velocity is a ____ quantity.
How fast and object is moving?
Distance over time.
The rate at which an object changes position.
Displacement over time.
The maximize velocity, must maximize what?
Amount displaced from original position.
The rate at which an object changes its velocity.
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?
Can a person be moving very face and still not be changing velocity?
Acceleration has to do with _______ ?
Changing how fast and object is moving.
Acceleration is a _____ quantity.
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.
Weight is a ____ quantity.
Determined by the amount of matter that is contained by the object. (How much stuff is in the object)
The force of gravity acting on an object. (the force with which gravity pulls upon that stuff).
A 1kg mass is how many newtons? How many pounds?
10 Newton =
= 1 kg
Gravitational distance changes when?
When the distance between their centers change.
Momentum is a ___ quantity.
"Mass in motion" - quantity of motion an object possesses.
Momentum (p) =
Mass x velocity
Will something that has a lot of momentum be easier to stop?
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?
If you quadruple the velocity, what happens to the momentum?
A small change in momentum variable means what?
A big change in momentum