Test One Chapter three Flashcards
what is qualitative motion analysis
describes how the body looks as it performs skills
what does qualitative motion analysis included
position in space, position of body parts relative to each other, position of segments of body parts in relation to each other
what are the two general approaches to qualitative analysis
composite and component
what is a composite approach
views the whole body as a system that progresses through phases as it refines movement patterns, “Total body”
what is component approach
uses the same phase method, but breaks the body down into component sections
stages of skill progression are based on
the product of all body parts in combination
what is quantitative motion analysis
stems from the simple need for deeper understanding of why the system moves the way that it does, based on expertise
what is a scalar quantity
a quantity that possesses only a magnitude but has no particular direction
what is mass
quantity of matter of which a body is composed
what is inertia
resistance to having a state of motion changed by the application of force
what is a vector quantity
can only be fully specified with a magnitude of appropriate units and precise direction
what is weight
a measure of the force with which gravity pulls on an object’s mass
what are some vectors representing forces
direction, orientation, magnitude, point of application, line of action
what is direction
way the force is applied
what is orientation
alignment of the vector in relation to cardinal directions
what is magnitude
size of the applied force
what is point of application
point at which the system receives the applied force
what is line of action
imaginary line extending indefinitely along the vector through the tip and tail
a point in space requires
three coordinates
the location of a point in a plane formed by two axes requires
two coordinates
if a point is on one axis then its location can be designated with
one coordinate
segments are represent with
lines connecting points
segments are usually
bony levers and the joint is the origin
forces are represented by
vectors or arrows
polar coordinate system is used when describing
rotation, angluar motion
vector equality is
two vectors are considered equal if they possess the same magnitude and direction
what is a resultant
a vector that represents the sum of all forces acting upon a system
vector resolution
process used to resolve a single vector into its individual directional component vectors
component vectors
the individual vectors that represent each of the multiple effects that one vector represents
horizontal component contains
x=rcostheta
vertical component contains
y=rsintheta
vector composition
addition of two or more force vectors to find resultant
factors that affect complexity of vector composition
number of vectors, relative directions and orientations of the vectors
