The play which utilized a moment of inertia by the children

Tomonori Ito

moment of inertia play kinetic energy

(inertia)

()

( )

－ 25 －

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t 1/2 v v

r 1/2

( )

1 1 2 2 n n

－ 26 －

1)

( )

－ 27 －

1/2( )

( )

( 7)

( )

( )

( )

- 1.79rad/sec- 5.74rad/sec

(2 rad=1 )( )

(L= )( ) ( )( )

(1/2 )

( )

( )

－ 28 －

( )

( )

( )

( )

( )

( )( 10)

10 ( ) ( )

－ 29 －

( )

( 11)

11

12

12

1/2( )

( )

2)

2)

1

2

－ 30 －

Japanese Journal of SPORTS SCIENCES,

－ 31 －