E3: Angular Kinetics Flashcards
___ ___ is about rotation and forces experienced while rotating
angular kinetics
angular kinetics is about ___ and ____ experienced while rotating
rotation, forces
when an object is rotating, it typically turns about a __ __
pivot point
rotation can be at an ____ end point or from an ___ balance point
external, internal
rotation can be at an external ___ point or from an internal ___ point
end, balance
___ of ___ is an example of an internal balance point
center of gravity
gravity can cause and initiate ___ or ___ rotation
rotation, limit
___ can cause and initiate rotation or limit rotation
gravity
what is the fundamental principle of angular kinetics
gravity
when falling, do we continue to increase speed until we hit something
no
___ is the point where gravity acts equally on the body
CoG
do body portions make a difference on one’s center of gravity
yes
can athletes shift their center of gravity
yes
athletes can shift their center of gravity from one position to another to position it in certain ways to produce ____ performance
optimal
shifting one’s center of gravity can be done to increase ___ or to apply the greatest amount of __
stability, force
projectile motion is a combination of ___ and ___
acceleration, gravity
acceleration due to gravity of a ball that is being thrown, ____ as it goes up
slows
when a ball is thrown, the acceleration due to gravity means there is no ___ ___ at the top
vertical motion
when a ball is thrown, the acceleration due to gravity causes it ___ ___ as it comes down
speed up
___ ____ describes the quantity of motion that a rotating athlete/ object possesses and is the product of mass * angular velocity
angular momentum
angular momentum describes the ___ of motion that a rotating athlete/ object possesses
quantity
3 components that make up angular momentum
mass, rate of rotation, mass postition about radius of gyration
athletes need to find a balance between ___, ___ of mass, and ___ velocity
mass, distribution, angular
the principle of conservation of angular momentum is the rotary equivalent of Newton’s ___ law of inertia
1st
in a rotary sense, spinning objects will continue to spin as long as ___ stops them
nothing
the amount of angular momentum that divers possess in flight is determined by 3 things
moment of inertia, mass, mass distribution about radius of gyration
if diver’s are in flight, the total angular moment ___ change
doesn’t
if 1 factor involved in creating angular momentum is reduced, then another component must ___
increase
if 1 factor involved in creating angular momentum is ___, then another component must increase
reduced
can angular momentum be transfered
yes
the key components to transferring angular moments are __ and angular ___
mass, velocity
what is the center of gravity? How do athletes manipulate their CoG?
- CoG is the point where gravity acts equally on the body.
- By shifting from one position to another.
What are the three factors that contribute to angular momentum?
mass
how mass is positioned relative to the radius of gyration
angular velocity
How does angular momentum relate to projectile motion?
angular momentum has no external forces applied.
In projectile motion, gravity is considered to be an external force.
