Gaya Gesekan Gaya Memengaruhi Gerak Benda

90 Mudah dan Aktif Belajar Fisika untuk Kelas X ,63E293=236C:36B2CC285::2D56?82?C6ED2CD2=:H2?8A2?;2?8?H24 6E5:2?5:AED2B636?DE=:?D2C2?6=:?82B56?82?6=2;E2? C -6?DE2? 82H2C6?DB:A6D2=3=236C:D6BC63ED 4 :6D29E: 88 4 + C R = 80 c m m = 50 g Contoh 5.4 C 0 + , 652A2D5:DE=:CC63282:36B:ED + 6B=E ?52 A6B92D:2? 329G2 82H2 C6?DB:A6D2= 6BEA22? CE2DE :CD:=29E?DEB6CE=D2?82H2H2?82B29?H26?E;EAEC2D 2H2C6?DB:A6D2=;E8252A2D?52D6E:A25286B26=:?82B36?52 36?52=2?8:DD6B9252A36?52=2?8:D=2:??H2 ,63282:4?D93E=2?H2?8 C6=2=E6?86=:=:?8:E: 6?82A2 E=2? C6=2=E 6?86=:=:?8: E: 2H2 2A229 H2?8 36BD:?52C63282:82H2C6?DB:A6D2=2B:EE6GD?5:6D29E:329G2 2?D2B25E23E2936?52H2?86:=::2CC252?5:A:C292?=69;2B2 D6BD6?DE 366B;2 C63E29 82H2 D2B:6?2B: H2?8 36C2B?H2 C632?5:?8 56?82? 2CC2 36?5236?52 D6BC63ED 52? 36B32?5:?8 D6B32=: 56?82? E25B2D;2B2A:C292?D2B236?5236?52D6BC63ED 2H2:?:5:C63EDC63282: 82H28B2F:D2C: 2H2:?:=29H2?86?H63232?E=2?36B86B26?86=:=:?8: E: 25: H2?8 36BA6B2? C63282: 82H2 C6?DB:A6D2= A252 86B2 E=2? 6?86=:=:?8:E:252=2982H28B2F:D2C:2?D2B2E=2?52?E: N ?52D6=296?86D29E:329G286B23E=2?5:A6?82BE9:82H2D2B:E: :DE?8=29 36C2B82H2D2B:E:D6B9252A3E=2?D6BC63ED .?DE6?86B;22?DE82C:?:?52 A6B=E6?86D29E:36C2B2?36C2B2?E:52?3E=2?H2?85:3EDE92?52=2 A6B9:DE?82?D6BC63ED Mari Mencari Tahu 2H2C6?DB:A6D2=5:A6B=6956?82?6?88E?2 2?A6BC222? CA + 2 CA 2 4 ms 0,1kg 2 N 0,8 m 25:82H2C6?DB:A6D2=3=236C:252=29 Sebuah benda bermassa 200 gram diikat dengan tali ringan. Kemudian, diputar secara horizontal dengan kecepatan sudut tetap 5 rads. Panjang tali tersebut adalah 60 cm. Berapakah besar gaya sentripetal pada benda tersebut? a. 0,3 N b. 0,6 N c. 3 N d. 6 N e. 30 N UAN , 2001 Pembahasan Diketahui: m = 200 gram = 0,2 kg = 5 rads = 60 cm = 0,6 m F sp = 2 v m R Dalam kasus ini, = R. Dengan demikian, F sp = 2 v m R F sp = 2 m R F sp = 0,2 kg 5 rads 2 0,6 m F sp = 3 N Jadi, gaya sentripetal yang bekerja pada benda adalah 3 N. Jawaban: C Pembahasan Soal Kata Kunci • Hukum I Newton • Hukum II Newton • Hukum III Newton • gaya aksi • gaya reaksi • gaya gesekan • gaya sentripetal 2H2:?:;E8252A2D5:B2C22?=69D2?82??52 2H2D682?82? D2=::?:6BEA22?82H2H2?82B29?H26?E;EAEC2D52?A6?H6323 3=2D6BC63ED36B86B26=:?82B 2=292=:?:H2?836BA6B2?C63282: 82H2C6?DB:A6D2= 252=2982H2D682?82?D2=: 91 Dinamika Gerak

B. Penerapan Hukum Newton

252328:2?:?:?5222?6A6=2;2B:3636B2A2A6?6B2A2?9EE 6GD?52=269:5EA2?C692B:92B:

1. Gerak Benda pada Bidang Datar

,63E2936?52D6B=6D2A2523:52?852D2B=:4:?C6A6BD:A252 + 6E5:2? 5:36B: 82H2 6?52D2B 9:?882 36?52 36B86B2 =EBEC 56?82?A6B46A2D2? 2H282H2H2?8366B;2A252CE3E.252=29 . , 6?52D:5236B86B2D6B9252ACE3E.22 . , N , 2H2H2?8366B;2A252CE3E- - Tes Kompetensi Subbab A , +22 1 , :DE?882H2H2?85:3EDE92?C63E293:=H2?82CC2 ?H2 8E?DE6?42A2:646A2D2? C52=2 G2DEC ,63E2982H2366B;2A25236?5236B2CC2 52? A6B46A2D2?H2?85:D:3E=2? C 2H2H2?8C22 366B;2A25236?52=2:?36B2CC2 A6B46A2D2?H2?8 5:D:3E=2? C 2 6B2A229?:=2:B2C: 1 2 3 :2 52? 5:823E?836B2A2A6B46A2D2?H2?8 5:92C:=2?=6982H2 ,63E293EC2CC2?H2 836B86B256?82?6 46A2D2? ;2 3:=5:B652?36B96?D:C6D6=29 6?6AE9;2B2 -6?DE2?82H2B6H2?8 366B;2A2523:=D6BC63ED ?52C652?836B2525:52=2C63E29A6C2G2DD6B32?8 A2526D:?88:2? 2: 6B2A2A6B C6?29A6BE3292?36B2D3252??52 ,6AD?832DE32D2H2?82CC2?H2 8D6B=6D25:2 5:2D2CD2?29 6E5:2?32DED6BC63ED5:D2B:62D2C 56?82?82H2C6=22 C=2=E5:=6A2C2? :2 C D6?DE2? D:?88: 2C:E H2?8 5:42A2:?H2 ,63E293=236B2CC2 8B25::2DA252E;E?8 C6ED2CD2=:H2?8A2?;2?8?H24 =236BAED2B52 =2=:?82B2?9B:I?D2=56?82?6=2;E2?D6D2A C :DE?8D682?82?D2=: ,63E29A:B:?82?56?82?;2B:;2B:45:AED2B56?82? 646A2D2?CE5ED B25 C -6?DE2?A6B46A2D2?52? 82H2C6?DB:A6D2=C63E29D:D:36B2CC2 8H2?836B252 5:A:?88:BA:B:?82?D6BC63ED ,63E29 3=2 36B2CC2 8 5:AED2B 6?8:D2B: =:?82B2?F6BD:2=H2?8B25:EC?H256?82?=2;E C :DE?8D682?82?2C:E52?D682?82?:?: E D2=: H2?8 6?89E3E?82? 3=2 6 AEC2D =:?82B2?;:2 C ,63E296?52B22?6?:E?85:=:?D2C2?;2=2?6? 52D2B2C2B56?82?;2B:;2B:6=6?8E?82?2CC2 6?52B22? 52? A6?EA2?8 8 -6?DE2? 646A2D2?2C:E282B6?52B2?D:52C=:A;:282H2 86C62?2?D2B232?52?;2=2? ,63E293:=6=6G2D:;2=2?463E?8 :6D29E: B25:EC 2CC23:=36C6BD2A6?EA2?8?H2 8 2H2D62?3:=D6B9252A;2=2? :2 A6B46A2D2?8B2F:D2C: C D6?DE2?=2;E3:=A252 C22D65E5E2?D6BD:?88: Gambar 5.8 Gaya-gaya yang bekerja pada balok. N F w