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7 ͹Ẻع

7 ͹Ẻع
7.1 ع ԧФԧ
͹Ẻع ѵҨعѺͺ᡹˹ع仴͹仴 ͹ͧ١ҧ ١ص 繵 Ѻѵٻç͹ çзӵѵçҹٹҧ зѵ͹Ẻ͹˹ҧ çзӵѵҹٹҧ դ ͧç ٹҡзӵѵ ѵبع
عͧѵͺ᡹ع֧ ¢ͧѵա͹ǧ蹡ѹ ѧѵب֧ѵԧ㹡عҡѺ¢ͧѵ ѵԧ ¶֧ ѵԧ˹ 繤ѵԧ¢ͧ͹㹪ǧ ҡ
    / t ..(7.1)
 ѵԧͺ᡹ع
  ѵءҴ㹪ǧ
t ҷ㹡ع
㹪ǧ ᡹عҧǵ駩ҡѺйҺͧ͹ͧǧ Ҵ仨йҺͧ͹
ȢͧҴ繻ҳǡ ¡ áШѴԧ [ ] ҷȢͧ   顮͢ ͢ҡͺ᡹ع¹Ƿ价ҧȷҧع ͪȢͧáШѴԧ
ҳͧѵҡáШѴԧ 繻ҳǡ ¡ ԧ [] շ价ҧǡѺȢͧ  
    / t
ѵع¤ԧ褧 Ҥԧ [  ] ¶֧ ѵҡ¹ŧԧ
    / t ..(7.2)
  [ 1 - 2 ] / t .(7.3)
2  1 + t ..(7.4)
7.2 졡Ѻ͹Ẻع
(  ) ͼŤٳҧçзҧ駩ҡҡç֧شع ;ٴ ͧçͺشع ͧ 繻ҳǡ ˹ N.m
 = Fr (7.5)
= mar
= m (r)r
 = mr2 .(7.6)
I = mr2 = ˹ҷԧع 繻ҳ˹ Kg.m2
ѧ  = I .(7.7)

- ԨóҨҡè դѹѺ Ǥ ҷ졷зӵ
ѵդҤ ѵطعդԧ ҡ 㹷ҧѺѹ
ѵ㴷عդԧҡ ¹
- ¢ͧѵ ҡ͹¢ѺҧҡŶ֧شع
- з˹ҷԧع ¤ҨоҹҾ¹ŧعͧѵ
- ѵ ҡѹ ѵ˹աáШ¢ͧ ( r ) ᵡҧѹ еҹ¹Ҿعᵡҧѹ 蹤ᵡҧѹ
- ѵ ҡѹ ѵ˹աáШ¢ͧҡ ҡ 蹤ͨѡҾعҹ
- ѵ ҡѹ ѹ¤ԧҡѹҡѹ ѹҡҨѡҾعҹ
- ѵѹ˹ ع¤ԧҧѹ ѵطع¤ԧҡҨѡҾعҹ
- ѡҾعͧѵآѺԧ¢ͧѵعͧ
7.3 ԧ ( L )
ԧͧԧ鹹ͧ 繻ҳǡ ˹ Kg.m2 / s
ҡ  = I  = Fr = mar
I  = mar
I (  / t ) = mr ( v / t )
I1 - I2 = r ( mv2 mv1 )
L = ԧ = I = rmv
L2 L1 = r ( P2 P1 )
L = r P
L = rP
 = L / t .(7.8)
ҷѾзӵѵդٹ 觼ŷԧ¹ٹ
ѧ L1 = L2
I11 = I22 (7.9)
¡âҧ ͹ѡԧ





7.4 ѧҹŹͧع
ҡ Ek = ( 1/2 ) mv2
= ( 1/2 ) m2r2
= ( 1/2 ) I2 (7.10)
ѵա͹Ẻ ѧҹŹͧѵبҡѺѧҹŹͧ͹ѺѧҹŹͧع
Ek = ( 1/2 ) mv2 + ( 1/2 ) I2 .(7.11)

Ex I ͨѡҹҴ鹼ҹٹҧ 1 m Ѻçзعͺ᡹ ҡش觨դ 100 rad/s 10 s
. ԧ . Ҵ 20 s . ӹǹͺع 20 s
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Ex II ѹ˹觷鹼ҹٹҧ 2 m عҡش觴¤ԧ 2 rad/s2 10 s ͹դԧФԧ
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Ex III ѵطçͧ͹ҡѹ 100 g 10 20 cm ӴѺ ºº
¢ͧѵͧ͹
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Ex IV ѵطçͧ͹ҡѹ 1000 g 10 cm ١졡зعҴ 0.02 N.m
ѵعع¤ԧ
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Ex V ¤˹׹躹عͺ᡹عǴ觢Ҵ 5 Kg.m2 Ҷʹ˹ѡҧ 10 kg ҧᢹ͡ 1 m ж١ع¤ 1 Hz ŴᢹŧҧҡӵǢҧ 20 cm Ҩع¤ ա¹ŧ
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Ex VI ѵѹ˹觶١عѺ¤褧 4 ͺ/Թҷ ͺ᡹ع
10 Kg.m2 ҤҾѧҹŹͧعͧѵع
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Ex VII ٻçк͡ѹ˹ 5 cm ͺ᡹ҧ 1 Kg.m2 100 g ѧŴ¤ 10 cm/s ҤҾѧҹŹͧá駢ͧ
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Create Date : 26 Ҥ 2554
Last Update : 26 Ҥ 2554 16:07:36 . 0 comments
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