Meniskus Cembung dan Meniskus Cekung

Mudah dan Aktif Belajar Fisika untuk Kelas XI 150

B. Viskositas Fluida

6H6I::CH6A6CB:FIE66C:G:6CL6C9BADA:=;AI96 :G:6C 96E6H H:F?69 6CH6FE6FH:A M6H 86F 6H6I :G:6C 6CH6F6 M6H 86F 96C 9C9C E:FBI66C H:BE6H M6H 86F H:FG:7IH 7:F696 .:H6EM6H86FB:BAJGDGH6GL6C7:F7:96 +696 96E6H 9A=6H D:;G:C JGDGH6G 7:7:F6E6 ;AI96 E696 7:F766 GI=I :6966C GI=I986CHIB6C96A6BH67:AH:FG:7IH6F:C6JGDGH6G7:F6CHICE696 GI=I .:B6C 7:G6F GI=I B66 G:B6C :8A JGDGH6GCL6 7:HI EIA6 G:76ACL6 .6HI6C JGDGH6G 96A6B GGH:B . 696A6= GB G:96C6C 96A6B GGH:B 8G 696A6=

1. Hukum Stokes

AI969:6A696A6=;AI96L6CH96B:BAJGDGH6G::CH6A6C 6 G:7I6= 7:C96 7:F:F6 9 96A6B ;AI96 9:6A 7:C96 H:FG:7IH H96 66C B:C6A6B 6L6 :G:6C 69 H:6C6C ;AI96 G:7:AIB 96C G:GI96= B:A:K6H GI6HI E:C=6A6C H96 66C 7:FI76= 6H6I 7:G6FCL6 H:H6E -:GIAH6C 6L6 L6C 7::F?6 E696 G:H6E HH 6AF6C ;AI96 696A6= CDA 6 7:C96 7:F:F6 96A6B ;AI96 L6C B:BA JGDGH6G 66C H:F?696L6:G:6CH6F67:C9696C;AI96 6L6H:FG:7IH9C6B66C - 6 7:C96 L6C 7:F:F6 96A6B ;AI96 H:FG:7IH 7:F7:CHI 7DA6 7:G6FCL6 6L6 .HD:G 9FIBIG6C G:766 7:FIH . P :H:F6C6C 6L6 .HD:G D:;G:C JGDGH6G GB ?6F ?6F 7DA6 B :8:E6H6C F:A6H; 7DA6 H:F=696E ;AI96 BG +:F=6H6C - .:7I6= :A:F:C 9?6HI=6C 9 96A6B H67IC L6C 7:FG GI6HI ;AI96 6 :A:F:C H:FG:7IH 9?6HI=6C : 96A6BH67ICL6C7:FG;AI969:6A- H9666CH:F?69 E:FI76=6CF:GIAH6C6L6676H:G:6C;AI96 6CH:H6E?6:A:F:C 9?6HI=6C : 96A6B H67IC L6C 7:FG ;AI96 H96 9:6A - 66CH:F?69E:FI76=6CF:GIAH6C6L6L6C7::F?6 6AH:FG:7IH 96F:C66C 696CL6 E:C6FI= 6L6 :G:6C Sumber: Physics, 1993 D:;G:C1GDGH6GICHI:F766 686BAI96 F Q P Q P Q P 6F6= Q P +A6GB696F6= Q P H=A6AD=DA Q P A. Q P AG:FC Q P 096F6 Q P 9FD:C Q P 06E6F Q P ,-0- 3 . Gambar 6.21 a Sebuah kelereng dijatuhkan ke dalam fluida ideal. b Sebuah kelereng dijatuhkan ke dalam fluida tak ideal. 6 7 6B76F7:FIHB:AIG6CG:7I6=EDBE6=9FDA +:C6BE6C:8AAI6GCL68B 96CAI6GE:C6BE6C 7:G6F8B 6E696E:C6BE6CL6C:8A97:F 6L6 7:F6E66= 6L6 L6C 7::F?6 E696 E:C6BE6C7:G6F F .:7I6=76ADL6CJDAIB:CL6B 96CB6GG6?:CGCL6 B 9B6GI6C : 96A6B BCL6 L6C B6GG6?:CGCL6B 6 66B6C66=EDGG7:C96 7 HICJDAIB:7:C96E696E:FBI66CBCL6 8 HIC 6L6 F8=B:9:G L6C 7::F?6 E696 7:C96H:FG:7IH Fluida 151 +696 - 6L6 6L6 L6C 7::F?6 E696 :A:F:C 696A6= 6L67:F6H:A:F:CL6C9B76CDA:=6L6.HD:G96C6L6F8=B:9:G +:CB76C6C6L6H:FG:7IHH:FIG7:FA6C?IHG:FC9:C6C:F6:A:F:C +696G66HH:FH:CHI6L6L6C7::F?6G:B76CG:=C6F:GIAH6CG:AIFI=6L6 H:FG:7IH 66C G6B6 9:C6C CDA 6 7:C96 7:F:F6 9:C6C :8:E6H6C B6GBIB L6C H:H6E :8:E6H6CCL6 C 9G:7IH .:86F6 B6H:B6HG :8:E6H6C H:FBC6A 96E6H 9HIFIC6C 96F FIBIG FIBIG 7:FIH P P G G P P 0CHI 6L6 : 6H6G F8=B:9:G f 0CHI 6L6 .HD:G G H :F6H7:C961 96EIC:8:E6H6CH:FBC6A7:C96G:H:A6=6L6 6L6L6C7::F?6G:B76C 696A6= P 0CHI 7:C96 7:F7:CHI 7DA6 9:C6C ?6F ?6F B66 JDAIB: 7:C96 7 69 P G:96C6C JGDGH6GCL6 696A6= P :H:F6C6C b B6GG6 ?:CG 7:C967DA6 B f B6GG6 ?:CG ;AI96 B JDAIB:7:C96B v t :8:E6H6C H:FBC6A 7:C96 BG D:;G:C JGDGH6G GB .:7I6=:A:F:CL6C7:F?6F ?6F8B9?6HI=6C:96A6BBCL6E:AIB6GL6C 7:F69696A6BH67IC :CHI6CA6=:8:E6H6CH:FBC6AL6C986E6:A:F:C?6 B6GG6?:CGBCL6B D:;G:CJGDGH6GBCL6Q P +6GB6GG6?:CG :A:F:CQ B 96CE:F8:E6H6CF6JH6G BG 1 8BQ P B b Q B f B BG Q P +6G Contoh 6.7 Gambar 6.22 Gaya-gaya yang bekerja pada kelereng di dalam fluida. F A F s w = mg Kata Kunci • gaya stokes • kecepatan terminal • viskositas