E3: Angular Kinetics

Question 1

___ ___ is about rotation and forces experienced while rotating

Answer 1

angular kinetics

Question 2

angular kinetics is about ___ and ____ experienced while rotating

Answer 2

rotation, forces

Question 3

when an object is rotating, it typically turns about a __ __

Answer 3

pivot point

Question 4

rotation can be at an ____ end point or from an ___ balance point

Answer 4

external, internal

Question 5

rotation can be at an external ___ point or from an internal ___ point

Answer 5

end, balance

Question 6

___ of ___ is an example of an internal balance point

Answer 6

center of gravity

Question 7

gravity can cause and initiate ___ or ___ rotation

Answer 7

rotation, limit

Question 8

___ can cause and initiate rotation or limit rotation

Answer 8

gravity

Question 9

what is the fundamental principle of angular kinetics

Answer 9

gravity

Question 10

when falling, do we continue to increase speed until we hit something

Answer 10

no

Question 11

___ is the point where gravity acts equally on the body

Answer 11

CoG

Question 12

do body portions make a difference on one’s center of gravity

Answer 12

yes

Question 13

can athletes shift their center of gravity

Answer 13

yes

Question 14

athletes can shift their center of gravity from one position to another to position it in certain ways to produce ____ performance

Answer 14

optimal

Question 15

shifting one’s center of gravity can be done to increase ___ or to apply the greatest amount of __

Answer 15

stability, force

Question 16

projectile motion is a combination of ___ and ___

Answer 16

acceleration, gravity

Question 17

acceleration due to gravity of a ball that is being thrown, ____ as it goes up

Answer 17

slows

Question 18

when a ball is thrown, the acceleration due to gravity means there is no ___ ___ at the top

Answer 18

vertical motion

Question 19

when a ball is thrown, the acceleration due to gravity causes it ___ ___ as it comes down

Answer 19

speed up

Question 20

___ ____ describes the quantity of motion that a rotating athlete/ object possesses and is the product of mass * angular velocity

Answer 20

angular momentum

Question 21

angular momentum describes the ___ of motion that a rotating athlete/ object possesses

Answer 21

quantity

Question 22

3 components that make up angular momentum

Answer 22

mass, rate of rotation, mass postition about radius of gyration

Question 23

athletes need to find a balance between ___, ___ of mass, and ___ velocity

Answer 23

mass, distribution, angular

Question 24

the principle of conservation of angular momentum is the rotary equivalent of Newton’s ___ law of inertia

Answer 24

1st

Question 25

in a rotary sense, spinning objects will continue to spin as long as ___ stops them

Answer 25

nothing

Question 26

the amount of angular momentum that divers possess in flight is determined by 3 things

Answer 26

moment of inertia, mass, mass distribution about radius of gyration

Question 27

if diver’s are in flight, the total angular moment ___ change

Answer 27

doesn’t

Question 28

if 1 factor involved in creating angular momentum is reduced, then another component must ___

Answer 28

increase

Question 29

if 1 factor involved in creating angular momentum is ___, then another component must increase

Answer 29

reduced

Question 30

can angular momentum be transfered

Answer 30

yes

Question 31

the key components to transferring angular moments are __ and angular ___

Answer 31

mass, velocity

Question 32

what is the center of gravity? How do athletes manipulate their CoG?

Answer 32

1. CoG is the point where gravity acts equally on the body.
2. By shifting from one position to another.

Question 33

What are the three factors that contribute to angular momentum?

Answer 33

mass
how mass is positioned relative to the radius of gyration
angular velocity

Question 34

How does angular momentum relate to projectile motion?

Answer 34

angular momentum has no external forces applied.

In projectile motion, gravity is considered to be an external force.