72
Mudah dan Aktif Belajar Fisika untuk Kelas X
00,92,9 60.0;,,9=??,=
;04:0= 9?6=,?;?,,9,,?=,?;04:0
-0=,=??B,92408;?3
,,7,3
2
,4,9,,? D092,908464,9
2
,4,9 D ,4,9
D
,4,9 D
0.0;,,9=??,;,4?74=,7,8;?,,98094-4,=,4=0-? ,49B,
,,?,7,8
,7,880
9B070=,46,9=:,76,,926,,929,80908?6,9;0=0;=4B,926074? 84=,79B,;09204,9,4106?09=4=??4106?09=4=??4=494-?6,9
-,9B,69B, ;?,,9 B,92 408;?3 =04,; =,?,9 A,6? 0,;4 -0=, 60.0;,,9=??=04,;=,?,9A,6?0-438?,3546,9,80743,
=,?,99B,B,4?,=
3. Hubungan Laju Linear dan Kecepatan Sudut
?-?92,9,9,,7,5?7490,,960.0;,,9=??,92?704;0:703 092,980922,-?926,9
0,9
0
=034922,
4;0:703 ,9
,460?,;0=,8,,90=0-?4;0:703 E
,7,8 =,? ;04:0 ;,4607 80908;?3 =?? =0-0=, 092,9
08464,960.0;,,9=??9B,,,7,3
E 00,92,9
60.0;,,97490,8= 60.0;,,9=??,=
5,45,48 03,46,9
0 ,4 ;0=,8,,9 0=0-? ,;,
46,,6,9-,3A,?9?660.0;,,9=?? 009?60.0;,,97490, 4;092,?34:7035,,603,,;;?=,;?,,9
80?;,6,9=608,=0-?,3;4492,9B,92=0,92-0 ;?,?8-?;?,9B,070,64446;?=,;4492,94492,90=0-?
=0,92-0;?,,92,960.0;,,9=??B,926:9=,949B,=04,; =07,92A,6?B,92=,8,446,,?44680908;?3=??;?,,9
B,92 =,8, 446 ,9
80?;,6,9 446446 B,92 070,6 ;,, ;4492,90=0-?=008464,9=034922,
092,96,,7,49 446
80847464749,=,974926,,9B,925,45,49B,70-43-0=,,4;,, 5,45,4749,=,9446
0=,60.0;,,97490,=0-?,3446;,,;4492,9 B,92=0,92-0:,=44;092,?34:7035,,64460=0-?,4446;?=,
,4
,;,4=48;?76,9-,3A,60.0;,,97490,446 70-43-0=,,4;,,60.0;,,97490,446
08,64906,=0-?,3 446 ,4 ;?=, ;?,,9 =08,649 60.47 60.0;,,9 7490,9B, ,;?9
60.0;,,9=??446 =,8,092,960.0;,,9=??446
Gambar 4.3
Kecepatan linear dipengaruhi oleh jarak benda terhadap pusat putaran
pada kecepatan sudut tertentu. v
A1
B B
1
B
B1
A
1
v
A0
A O
t
2
= t + t
t
1
= t
Informasi
untuk Anda
Penggunaan variabel kecepatan sudut dan kecepatan linear di
antaranya adalah mengenai hubungan roda-roda bergerigi.
Roda-roda bergerigi dihubungkan untuk mempercepat,
memperlambat, atau membalik putaran roda. Di antaranya adalah
1. Susunan seporos:
1
=
2
v v
= r
r 2. Susunan bersinggungan:
v
1
= v
2 1
r
1
=
2
r
2
3. Susunan terhubung sabuk: v
1
= v
2 1
r
1
=
2
r
2
Information for You
Uses of angular and linear velocity variable is about gear connection.
Gears connected to quicken, to slowing down or returning. There is:
1. One axis formation 2. Contact formation
3. Incircuit belt formation.
1 r
2
2 r
1
1 2
r
2
r
1
1 2
r
2
r
1
73
Gerak Melingkar
0-?,3-09,-020,68074926,092,960.0;,,9
;8:,=4;08094 4?927,3
, ;04:0;?,9B, - 60.0;,,9=??
. 7,5?7490,546,5,45,4:,=0;0, .8 .
;8
;?,,98094
;?,,9= C
, 04:0
,,7,360-,746,9,4106?09=4
C
= - 0.0;,,9=?? 434?92092,980922?9,6,9
0
2 f 2
C
8
,= . ,45,4 .8 8
,5?7490,434?9280922?9,6,9
0
R 8
8 1,6
8= ,4;04:0;?,,99B, =60.0;,,9=??9B,
8
,=,97,5?7490,9B, ,,7,3
8=
9?680924,4749,=,974926,,9=0-,9B,6 6,74 ;?,,9=0-?,3-09,80807?6,9A,6?8094
0,;,;04:0,9106?09=420,6,9-09,0=0-? 0-?,3:,?-49;08-,926474=46808474642,4=
092,38,9-0;?,;,, ;80,;,6,3 , 106?09=49B,
- ;04:09B, . 60.0;,,9=??9B,
7,5?7490,;,,;49224:, ?,?= 80924,4 749,=,9 8074926, 092,9
809209,,4=0;0,8::B,92,4?=9B, 8 092,9607,5?,9685,84?9260.0;,,9=??
=0;0,8::0=0-?,7,8,= 07,=6,9;09204,960.0;,,97490,,960.0;,,9
=?? 0-?,3-,?446,092,9,74608?4,94;?,6,9
46,;,95,92,74
800,9A,6?B,924-??36,9 ?9?6 807,6?6,9 =,? ;?,,9 ,,7,3
=06:9
-0,;,6,360.0;,,97490,-,?0=0-? ,,+
Tes Kompetensi Subbab
A
B. Percepatan Sentripetal
0-?,3-09,B,92807,6?6,920,68074926,-0,?,980847464 ;0.0;,,9B,92,,39B,809?5?446;?=,74926,,90.0;,,9494
4=0-?;0.0;,,9=094;0,7,,20,67??=-0,?,9,,360.0;,,9 -09, 0,; =034922, 06: 60.0;,,99B, 5?2, 0,; ,, 20,6
8074926,-0,?,9;0.0;,,9B,924847464-01?92=48092?-,3,,3 20,6,420,67??=8095,420,68074926,-0,?,9703=0-,-
4?;0.0;,,9;,,20,68074926,=07,7?809?5?60;?=,B,924=0-? ;0.0;,,9=094;0,7,,?;0.0;,,9,4,7,94-047,8-,92
,,20,68074926,,,360.0;,,97490,;,,=04,;446=07,7? 809B4922?9274926,,9,9,,39B,=07,7?-0?-,30?-,3,906:
60.0;,,94944=0-,-6,9,,9B,;0.0;,,9=094;0,7 ,,
546,60.0;,,9-09,;,,446 ,9-0??
?? ,9
8,6,-0,60.0;,,9 E
02442,=0-,92?9 092,9=02442, =034922,,6,94;0:703;0-,9492,9-046?
Gambar 4.4
Arah kecepatan linear pada gerak melingkar.
O R
K L
S
v
1
–v
1
N
M
v
2
v = v
2
– v
1
s
v –v
1
Contoh
4.3
Kata Kunci
• laju linear
• kecepatan sesaat
