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chapter 13 terms
terms
17
Biology
Undergraduate 3
11/01/2011

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Term
balance
Definition
a persons ability to control equilibrium
Term
base of support
Definition
area bound by the outermost regions of contact b/w a body and support surface or surfaces
Term

center of mass

mass centroid

center of gravity

Definition
point around which the mass and weight of a body are balanced, no matter how the body is positioned
Term
couple
Definition
paor of equal, oppositely directed forces that act on opposite sides of an axis of rotation to produce torque
Term
dynamic equilibrium (D Alembert's principle)
Definition
concept indicting a balance b/w applied forces and internal forces for a body in motion
Term
first class lever
Definition
lever positioned whith the applied force and the resistance force on opposite sides of the axis of rotation
Term
fulcrum
Definition
the point of support, or axis, whcih a lever may be made to rotate
Term
lever
Definition
a simple machine consisting of a relatively ridgid, barlike body that may be made to roate about the axis
Term
mechanical advantage
Definition
ratio of force arm to resistance are from a fiven lever
Term
moment arm
Definition
shortest (perpendicular) distance b/w a force;s line of action and an axis of rotation
Term
reaction board
Definition
specially constructed board for determining the center of gravity location of a body positioned on top of it
Term
second class lever
Definition
lever positioned with the resistance b/w the applied force and the fulcrum
Term
segmental method
Definition
procedure for determiniging total body center of mass location based on the masses and center of mass locations of the individual body segmants
Term
stability
Definition
resistance to disruption of equalibrium
Term
static equalibrium
Definition
motionless state characterized by =0
Term
third class lever
Definition
lever positioned with the applied force b/w the fulcrum and the resistance
Term
torque
Definition
the rotary effect of a force about an axis of rotation, measured as the produc of the force and the perpendicular distance b/w the force's line of action and the axis
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