E3: Angular Motion Flashcards
what are the two fundamental components for anything to rotate
axis of rotation, lever attached to reference point
the effect of the rotation is often measured from the objects
center of gravity
planes of motion and axis of rotation ___ share the same relationship but do share the same name
dont
angular motion planes moves ___ to the line of a plane of motions
parallel
name the 4 variables that come into play when an object rotates
velocity, force, inertia, momentum
does every joint move about an axis of rotation
yes
there’s a counter balance between ___ size and velocity
muscle, velocity
inertia is the law that an object will
remain in motion unless acted upon by an outside force
the ____ (acceleration) of the body limb has to occur in the follow through phase of a moment
inertia
angular velocity v angular speed.
angular ___: rigid body, assuming it will move about a circle at the same velocity. length doesn’t matter. this is about the distance it travels and the time it travels.
angular ___. this includes multiple body parts. Angular speed on the outside of the circle is greater than the body part on the inside of the circle.
velocity, speed
tangential velocity dictates how much force will an object be struck with. directly related to the radius of the circle and the angular velocity.
the formula to find tangential velocity is as follows
A * Raidus * (finish this)
centripetal and centrifugal forces are when the body itself is ___
rotating
whenever there is rotation, there is an interplay between __
finish this*
inertia,
___ force is pulling in towards the body
centripital
___ force is an object wanting to move away from the body
centrifugal
an increase in athletes rate of spin increases to the second power, or squares the demand for ___ force
centripetal
banks on an indoor track allow for the ____ force applied by the individual to be maximized by the track counteracting the centrifugal forces acting against you.
centripetal
what two forces are applied to a car when going around a curve too fast
centripetal and centrifugal
rotary inertia is an object’s ___ or ___ to rotation
resistance, persistence
what are the two important factors in rotary inertia
object mass and its distribution of the mass
when doubling your speed you have to __ the force applied
quadruple
the more ___ an object has, the more ___ it puts up against being rotated.
mass, resistance
rotary inertia is mostly applied ___.
instinctively
radius of ___ is the distance from the axis of rotation and the center of gravity for the segment that is rotating.
gyration
rotary interia is dictated by the radius of ___.
gyration
radius of gyration is the distance outside of the __ of ___
center of gravity
how an athlete initiates rotation.
why do we through a football thrown in a spiral?
for accuracy and distance
___ forces are applied about the center of gravity dictates if we spin less or more
where
___ forces make it easy to start a spin
verticle
