Concepts in Physics
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Transcript of Concepts in Physics
Center of GravityCenter of Gravity
The point in the body or object that its weight is balanced around
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Changes when weights or objects are attached to body
Line of GravityLine of Gravity
An imaginary vertical line that runs through the center of gravity
An object is most stable when the line of gravity passes through its base of support
Base of SupportBase of Support
The two-dimensional area between and including an object’s points of contact with the supporting surface
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StabilityStability
An object is most stable when the line of gravity stays within the base of support.
The larger the base of support, the more stable the object.
Stability is greater when the base of support is positioned in alignment with the direction of force application.
DefinitionsDefinitions
CreepStructural fatigue
Friction
Torque
Endurance limit; fatigue failureCumulative-trauma injuries vs. acute-trauma injuries
Definitions- Class DefinedDefinitions- Class Defined
Potential energyKinetic energy
Physiological Muscle Advantages
Multi-joint Muscles
Summation of Forces
Energy
(continued)
Definitions –Class DefinedDefinitions –Class Defined
Velocity
Acceleration and deceleration
Elasticity
Stress and strain
(continued)
Hooke’s lawStress-strain curve