Quiz 2 Flashcards
Tension
When forces are applied colinear in opposite directions
Mechanics
analysis of a force acting on an object
Compression
when forces are applied colinear and act towards each other
Shear
When two forces are applied in parallel and act in opposite directions
Figure 3-1 4 characteristics of a force.
Magnitude Direction of force Line of application Point of application F=m*a
Why know The 4 characteristics?
So you can decipher where the issue lies?
Power
is the rate of doing work or dissipating energy
Magnitude
the amount of push or pull
Gravity
A force directed toward the center of earth pull on everything equally 9.8m/s^2
Inertia
Is the tendency to resist changes in their state of motion
Bouyancy
When an object is placed in a fluid, the fluid exerts an upward force we call the buoyant force.
Force
A push or a pull
Load
an outside force acting upon a object
Pressure
defines how a force is distributed over an area
Strength
the ability of a muscle to produce or resist a force
V
^ ^
Describe forces
Top line : compression
Lower line : Tension
Ends to middle : Shear
V ===== I I I I Describe the forces
Top line : compression Lower line : Tension Corner : Shear Lower right: Compression Lower Left: Tension
Hooks Law
Definition
Example
F= k*X The force” or “the extension is proportional to the Change in length
Spring stretch or tendon
Newton’s 1st
Definition
Application
An object remains in its existing state of motion unless acted upon by an outside source
Head injuries, once a muscle has been fired it is easier to keep in motion
Newton’s 2nd
Definition
Application
If an outside source acts upon an object, it will change its velocity proportionally to the force applied.
rotating limbs
Newton’s 3rd
Definition
Application
Gravity An object will react with a force of equal magnitue and opposite direction o the first force.
???
Levers Class 1
teeter-totter
Force Fulcrum Load
Levers Class 2
Brachioradialis
Fulcrum Load Force
Levers Class 3
Fulcrum Force Load
Resolution of Forces
Dividing a force into its components
Composition of forces
Adding forces together to find the result of the forces
The process of injury repair
Inflammatory reaction with hematoma formation
Microphage infiltration
Fibroblastic and collage nous proliferation
Function of the satellite cells
Muscle strains causative factors 6
1 inadequate flexibility 2 inadequate strength/ endurance 3 dis-synergistic muscle contraction 4 insufficient warm up 5 poor biomechanics or style 6 inadequate rehab
