Term
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Definition
| Straight line connects midpoint of joints on either end |
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Term
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Definition
| Angle between line of pull and mechanical axis of bone |
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Definition
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Definition
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Term
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Definition
changes angle of pull
increases rotary component
patella |
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Definition
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Term
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Definition
Act at the same point of application
But at different angles |
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Term
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Definition
Not in the same line
But parallel to eachother |
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Term
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Definition
| a force whose direction is not in line with the center of gravity of a freely moving object or the center of rotation of an object with a fixed axis of rotation. |
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Term
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Definition
Turning effect of eccentric force
Product of force magnitude and length of moment arm. |
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Term
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Definition
Perpendicular to line of force
Distance to axis of rotation |
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Term
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Definition
| Change moment arm or force |
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Term
| Muscle force vectors for torque |
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Definition
Rotary component produces torque
Stabilizing component acts along mechanical axis of bone |
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Term
| Summation of torques results in... |
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Definition
| Either: no motion, linear motion, or rotary motion |
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Term
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Definition
Sum of torques
Clockwise are negative
Counterclockwise are positive |
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Term
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Definition
| A rigid bar that can rotate about a fixed point when a force is applied to overcome a resistance |
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Term
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Definition
Balance 2 or more forces
Favor force production
Favor speed and range of motion
Change the direction of the applied force |
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Term
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Definition
Bones = levers
Joint = fulcrum
Muscle = force |
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Term
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Definition
Fulcrum
Point of resistance
Point of force applied |
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Term
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Definition
| Perpendicular distance between fulcrum and line of force of effort |
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Term
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Definition
| Perpendicular distance between fulcrum and line of resistance force |
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Term
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Definition
| Effort -> fulcrum -> resistance |
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Term
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Definition
| Fulcrum -> resistance -> effort |
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Term
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Definition
| Fulcrum -> effort -> resistance |
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Term
| Acceleration of rotating bodies |
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Definition
| Torque = moment of inertia X angular acceleration |
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Term
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Definition
Depends on:
Quantity of rotating mass
Distribution around axis of rotation
I = Σmr2, m = mass, r = perpendicular distance between mass and axis of rotation |
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Term
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Definition
| Body position affects mass distribution and therefore inertia |
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Term
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Definition
Tendency to persist in rotary motion
Product of moment of inertia and angular velocity |
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