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20 Cards in this Set
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- Back
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stress
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the force per unit area of a structure measures the intensity of the force
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strain
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the change in length, angle, or shape when subjected to loading
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plasticity
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ability to permanently deform when loaded beyond its elastic limit
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creep
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deformation over time when constantly loaded
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recovery
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gradual return to original length when load is removed
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hysteresis
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phenomenon associated with energy loss exhibited by viscoelastic materials when they are subjected to loading and unloading cycles. the energy is lost usually in the form of heat
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shear
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force that is parallel to contacting surfaces and has an action line in direction of attempted movement
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Radicular pain
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pain in a predictable pattern associated with nerve root insult
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Radiating pain
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pain in predictable pattern associated with nerve injury. shooting pain
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Three types of referred pain
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visceral, myofacial, sclerotogenous
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visceral referred pain
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organ dysfunction results in pain in a predictable pattern
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myofacial referred pain
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pain in predictable pattern related to TrP or facial adhesions
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sclerotogenous referred pain
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pain in predictable pattern related to embryologic origin, often more sever than radicular pain, typically not peripheral, shooting pain with no signs of weakness, or MRI/reflex findings
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Sprain is an injury to a
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ligament
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Strain is an injury to a
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muscle or tendon
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what is the effort force
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the force affecting the direction of rotation; muscles often provide the EF
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what is the resistance force
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opposing force (torque). gravity and mass of the segment often provide RF
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effective arm is
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distance between the fulcrum and EF
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resistance arm is
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distance between the fulcrum and RF
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in first class levers the EA may be
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greater than, less than, or equal to the RA depending on the location of the fulcrum
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