chapter 7

Question 1

angular inertia

Answer 1

property of an object to resist changes in its angular motion

Question 2

moment of inertia quantifies

Answer 2

how an objects mass is distributed relative to a specific axis of rotation

Question 3

mass farther from the axis creates ___ angular resistance

Answer 3

more

Question 4

mass closer to the axis creates ___ angular resistance

Answer 4

less

Question 5

radius of gyration describes

Answer 5

how from from an axis of rotation all the objects mass must be concentrated to create the same resistance to change in angular motion as the object had in its original shape

Question 6

radius of gyration makes it easier to calculate

Answer 6

moment of inertia

Question 7

moment of inertia (I) depends on

Answer 7

mass, distribution of mass

Question 8

double the mass =2 x I
double the gyration=

Answer 8

4xI

Question 9

implement axis not passing through cg

Answer 9

eccenric axis

Question 10

what part of the implement does the performer hold

Answer 10

grip/end

Question 11

eccentric axis new axis called

Answer 11

parallel axis

Question 12

mass farther from axis of rotation means ___ is greater

Answer 12

moment of inertia

Question 13

3 principal axes in the human body

Answer 13

AP, transverse, longitudinal

Question 14

somersault plane and axis

Answer 14

sagittal, ML axis

Question 15

cartwheel plane and axis

Answer 15

frontal, AP axis

Question 16

twist plane and axis

Answer 16

transverse, ML axis

Question 17

altering the relative angle at a joint or joints changes moment of inertia by

Answer 17

changing the mass distribution around a joint axis

Question 18

angular momentum quantifies

Answer 18

the angular motion of an object

Question 19

angular momentum describes both

Answer 19

current state of motion, resistance to changing motion

Question 20

vector quantity needs

Answer 20

magnitude, direction

Question 21

Ha will change because of changes in

Answer 21

either or both I and w

Question 22

Ha of body is the sum of

Answer 22

angular momenta of individual segments

Question 23

angular momentum of an object remains constant unless a

Answer 23

net external torque acts on it

Question 24

for a rigid projectile, ____ is the only external force

Answer 24

gravity

Question 25

weight acts through the

Answer 25

cg

Question 26

weight has no ___ around the cg

Answer 26

moment arm

Question 27

weight creates no ___ on a projectile

Answer 27

external torque

Question 28

for faster spin, reduce ___ (arms __)

Answer 28

I, in

Question 29

for slower spin, increase ___ (arms___)

Answer 29

O, out

Question 30

repositioning one or more segments of a body must be countered byrepositioning one or more segements in the __ direction, maining constant ___

Answer 30

opposite, Hcg

Question 31

angularly accelerate=change in

Answer 31

angular momentum

Question 32

the change in angular momentum of an object is proportional to ____ exerted on it, and the change is in the direction of _____

Answer 32

the net external force, net external torque

Question 33

if I changes when T is applied, change in ___ is greater

Answer 33

w