48
Mudah dan Aktif Belajar Fisika untuk Kelas X
30B60=:A372?7932B2B9D:27A7A79;3553:7275385:7A 675593A7A79F503?8?9;93;B278AB62?793A7557;;727A7A79
203?63A733?A725;0?03?79BA 3AB9:6
8?9F527A3;B60=: 0 03?3?7260=:
Tes Kompetensi Subbab
A
--, 3:93?032A?8?923?726
;A=?57D03?8:27:7A33?A72 5;0?03?79BA
5390=:03?B9B?85
;2 :30? ;303:B;03?;70=:B::7;3:9B9
3; 235 03?:?7 ;357A?7 :5 30F9BA?7AB58?923?726
F5A3:627A3;B6F 339=?9A9;B:;B:03?229==?27AL
;
93;B27;3:=;A6755=77F;3;7:7979==?27A ;3AB98?923?7269A9
A3?30BA
B. Kelajuan dan Kecepatan
3?75A3?8279393:7?B2:;;3;6;7353?A79313A2 93:8B:;7:;B7799313A293:8B;3;7:797;903?032
A M93:8BN 2:; 06 55?7 2:6 3259 9313A2:6 313A3::B03?6B0B52353?
726:369?33?726;3?B903?C39A=?9313A 2A03?7:7=7A74AB35A7403?5AB52?63?726
3AB93?7263A77D879 92?03?8:2?793
0 =9=03?8:2?793 1 3::703?8:2?793
2 33503?8:2?793 ; ;
;
278?9F527A3;B6=?5A3?30BA2:6
; 03?F2:6
;L ; ; 27=?5A3?30BAA729;35:;73?726=77
;; ;
278?9F527A3;B60=:385 :7A2:6
;
2 2
6 8
; 273?7260=:2?7D:27A7A79;7
932B2B9967?27A7A792:6
;
Contoh
3.2
6 m
8 m A
B
C
x
Kata Kunci
• jarak
• perpindahan
49
Gerak Lurus
57;23593:8B3:8BA72903?6B0B5235 3?726;3:7903?6B0B52358?9:6AB:AF5
275B9BAB9;35B9B?93:8B2:62932? 03?;=A=?33?A7
;3B8B9993:8B;=
A=?2BABD9AB:369?38?9;3?B903?9:?;9 93:8B;3?B903?9:?
1. Kelajuan Rata-Rata Besar Kecepatan Rata-Rata
2B;B;F30B6932?F532503?53?9;35:;7 93:8B F5 03?032 3A7 A : 77 03?5AB5 2 A759A
93;13A278:?F29;3?F;93A797993 2? 27 8: 030 6;0A 2759 93A79 2 79
932?272:;9=AF53;7A2?;7:3;7A2?;7 ;3F300993:8B932?A3?555B2592593:8B
932?A7557?32606903?63A7;7:FAA3?6:57AB :7A93?3A7
7:F2:;3?8:A3?30BA2;33;B68?9
9; 2:;D9AB8;;993:8B?A?AF2:6
3:8B?A?A 8?9A3;B6 9;
D9ABA3;B6 8; 9;8;
3:8B?A?A2:68?9A=A:F527A3;B63A73:5D9AB A3?A3AB7993:8B?A?A27:;059 235 8?9F5
27A3;B627:;0592352D9ABA3;B631?;A3;A7 3?;F2A27AB:7
3:8B?A?AA3?;B903?9:?9?3A72903?5AB5 2?63?7262?730B603226F03?5AB5 2
8?9F527A3;B6F 2:65?4798?9A3?62D9ABL2B032
F503?53?92359313A9=A 35;3:76A93;7?755?722A;33AB906D
032:307613A2?72032 L
Gambar 3.4
Alat ukur kelajuan speedometer pada sepeda motor.
Gambar 3.5
Grafik jarak s terhadap waktu t dari benda A dan benda B.
3=?5A:3A03?:?7;33;B68?9 ;-9ABF5270BAB69F ;37A 3?93:8B?A?AA:3AA3?30BA
793A6B7
; ;37A
; ;37A
;;37A
; 259252B:7A;3;0F599313A30B6032F503?53?9
BA:624A?F5A3?27?7A;77;:
032F503?53?93?AAB:7993 13AF30571=A=69313A;=07:278:A=:2A;317 9;8;
Mari Mencari Tahu
Jarak s
Benda A Benda B
Waktu t
Contoh
3.3
50
Mudah dan Aktif Belajar Fisika untuk Kelas X
G7G63?579339=:6;3532?733223593:8BA3A ;3:; 3?A;7;03:39=03?79BAF93:8B332F
;6755A702739=:6
3AB9:6 8?9F527A3;B6G7G62?7?B;69339=:6
0 03?9313A?A?A3:;3?8: 793A6B7
; ;
?9F527A3;B63:;3:5D9AB 2
;
; ;
;
?92?7?B;69339=:6 ;
278?9F527A3;B63:;3:5D9AB 2
2:6 ;
;
; ;
2793:8B?A?A3:;3?8:2:6
;
2. Kelajuan Sesaat Besar Kecepatan Sesaat
3:8B?A?A03?03223593:8B3A3:8B?A?A 30B6032A72927:76A2?7932B2B9032A3?30BA03?2A3A7
27A78B2?73:B?B63?8:032A3?30BA2:;3:5D9ABA3?A3AB 3:8B 3A 03?5AB5 2 932B2B9 032 A 7AB
7:F2:;3?8:8?;7L?AB?93:8B30B6 0B385:7AA7293::B;2A;3::B78:?F
93:8B0B2A;3:30767 9;8;3A79;3B8BAB8B6329 03?63A70B03?53?923593:8BF5:30769317:69A
7A7?6A93:8B0BA3?30BA;235=:3:8B3A30B6 932? 2A 27:76A 2 A 7AB 3?B06 8?B;
;313?;793?B0693:8B2?730B6032 +AB9;353A6B793:8B932?2BABA275B9
7:7:7;7A2?793:8B?A?A23:5D9ABF55A9317: F7AB;3239A7=:
lim
t
s t
L
3. Kecepatan Rata-Rata
313A?A?ABAB03203?5AB5203?2?6 3?7263?A3:5D9ABF5270BAB6930B6932?
F503?53?9930?AAB93A7;B?23593:8BF5;A729 03??A7 ;3;7:797 9313A F5 ; B: 9?3 9313A 5A
03?5AB5 2 ?6 3?726 27 9313A 932? 2 1=A=6A3?30BA03?0329?3?63?726F03?032
:369?33?726;3?B903?C39A=?9313A?A ?A8B5A3?;B903?C39A=?3?;F2:6305703?79BA
Contoh
3.4
313A?A?A 3?726 3:5 D9AB
Dengan mengendarai mobil, Melisa menempuh jarak sejauh
z km dengan kecepatan x kmjam. Jika Melisa pulang
kembali dengan menempuh jarak yang sama dengan kecepatan y
kmjam, berapakah kecepatan pulang dan pergi Melisa?
?767:3?67AB5273?=:36:8B?A?AA:3A2:6
;:77A72903??A7 06DA:3AA3?30BA3:;03?:?73::B;3;7:79793:8B303?
;
Tantangan
untuk Anda
