75
Gerak Melingkar
Kata Kunci
• kecepatan sentripetal
• kecepatan sesaat
Tes Kompetensi Subbab
B
0-?,364;,=,9249-04,800
.8-0;?,;,, ;80,;,;0.0;,,9=094;0,7B,924,7,84
?5?92?5?9264;,= 0-?,3-,?446,092,9,74B,92;,95,929B,
8
,7,8 046 -,? 807,6?6,9
;?,,9 4?927,3;0.0;,,9=094;0,7-,?0=0-?
0-?,3;4492,9092,95,45,4.84;?,092,9 60.0;,,9=?? ,=09?6,9;0.0;,,9
=094;0,7=0-?,3446-08,==,2B,92-0,,4 ;49224;4492,90=0-?
,,+ 0-?,3-09,-020,68074926,092,9;0.0;,,9
=094;0,7 8= 09,0=0-?-020,6.8
,4;?=,74926,,946,5,,6-09,8095,46,74 =08?7,34?927,3;0.0;,,9=094;0,79B,
0-?,3-09,-020,68074926,,7,8A,6? =06:9-09,0=0-?07,3807,6?6,9;?,,9
0,;,6,35,,6-09,0=0-?03,,;;?=, 74926,,9546,;0.0;,,9=094;0,79B,
8=
C. Aplikasi Gerak Melingkar
1. Gerak Melingkar pada Bidang Vertikal
- -+
03,46,9
,,600,7?9.??=,3,B,924-046,9 03,,; 600, 7?9.? ,4 80=49 9024 649046 =0-07?8 749,=,9
8074926,3,?=80923,=476,960.0;,,984948?8B,92,;,809,3,9 ;09?8;,92=034922,4,65,?36046,600,-0,,4,,=749,=,9
0-0,092,9649.4,6=,=,6:,6:,4,6807,6?6,920,6 =,? 74926,,9 ;09?3 0,;4 20,6 8074926, 8,6=48?89B, 3,9B,
=0092,3 74926,,9 608?4,9 -:7,6-,746 =0;04 =0-?,3 -,9?7 4 749,=,90-,A,39B,0,;,=?,?-,9B,92809::926:,6:,,2,
,;,=07,7?-0,B?9092,9=08;?9,
Gambar 4.5
a. Kereta luncur roller coaster
b. Swing boat kora-kora
b a
Sumber: CD Image
0-?,3;4492,934,8=0,92-0;?,092,960.0;,,9=?? ;80,;,6,3 ;0.0;,,9=0-?,3446;?43B,92-0,,.8,4;?=,;4492,90=0-?
.
Contoh
4.4
460,3?4 ;8 .8F
E
8 ;8 ;?,,98094
;?,,9= ;?,,9= ,4106?09=4;?,,9;4492,90=0-?,,7,3
C 5,45,4 F
E
8
0.0;,,9=094;0,7,;,434?92092,9
0
2 2
2
C F
E
8
8= ,4;0.0;,,99B,,,7,3
8=
Kata Kunci
• arah radial
• gaya sentripetal
Di unduh dari : Bukupaket.com
76
Mudah dan Aktif Belajar Fisika untuk Kelas X
2. Gerak Melingkar pada Arah Horizontal
9,8,=43492,092,9;0.:-,,9B,9247,6?6,9;,,+-+ 0=?922?39B,20,6,9B,928090,;6,9;49=4;B,92=,8,
,;,9,743,;,,=6,7,B,9270-43-0=,84=,79B,;,,;08,49,9 :9,92,949203,46,9
46,9,=0,92809?922,924
;08,49,9 494 9, ,6,9 80,=,6,9 =0:7,3:7,3 =0,92 -020,6 4;0.0;,8094922,76,9;::=;?,,9
9?6809B003,9,6,9;0=:,7,984=,79B,:9,92,94920=0-? =0,92-020,6-07,A,9,9,,35,?85,8092,9607,5?,97490,=0=,,
B,920,;=0;044;0743,6,9;,,
9,B,92=0,92 809,464 :9,92,9492 80923,,; 60 ,,3 7?, 749,=,9 8074926,
60.0;,,9=0=,,;,,4464?,,7,3809B4922?9274926,,946,4,6 ,,B,92809,469,,749,,6,9-020,60-,928094922,76,9
749,=,9:9,92,94920-09,9B,9,=0,92-020,64;0.0;, 809?5?60,,3;?=,74926,,9
Gambar 4.6
Gerak penumpang pada permainan ontang-anting.
Tes Kompetensi Subbab
C
,,+ 07,=6,97,38092,;,;09?8;,92
4,6
5,?36046,=0,92-020,6808-09?674926,,9 046,9,46;08,49,9:9,92,94928092,;,9,
80,=,=0,6,9,6,90708;,,94;0.0;,809?5? 607?,749,=,9:9,92,9492
?74=6,97,3,;746,=420,68074926,7,499B,4=064, 9,
Gambar 4.8
Sebuah titik berpindah dari A menuju B.
t = 0
1 2
t = t B
A
D. Gerak Melingkar Berubah Beraturan
