44
Mudah dan Aktif Belajar Fisika untuk Kelas XI
Kata Kunci
• kelajuan orbit • konstanta gravitasi universal
• percepatan gravitasi • periode orbit
H 9H
796?-79 -056-=-71=7=571-?-4-=5-0-8-46?-79
Tes Kompetensi Subbab
B
.+ 110+ -.-4.;8-9-5:39-5:3919585759--73
0-:73?1=5-4-0-6-=-79 1-?05-:?-=-0- .;8-?1=1.??1=0--?1.-4.;8-71?53-D-:3.1=9--
73 1:?7-:
- =18?-:3-D-3=-A5?-5D-:3.171=6--0-.;8-
71?53- .
81?-7-?-;55.;8-71?53--3-==18?-:3-D- 3=-A5?-5:D-:;8
-?185?0-=58-:1?95919585751=5;014-=5 --95H
73 1:?7-:8-46-=56-=5;=.5? -?185??1=1.?
1=1-?-:3=-A5?-595051=97--:95-0-8-4 9
57-6-=56-=595H 945?:39--
61:595 -=56-=58-:1?,5?1=7-856-=56-=595 57-.1=-?
.-0-:-010595.1=--7-4.1=-?.-0-::D- 05,5?1=
1.-4.1:0-6-?4.1.-0-=571?5:335-: 91?1=05
-?-1=97--:95 1:0-91:--5?-:-40-8-9 B-7?01?57 57-.1:0-D-:3-9-056-?47-:-0-
71?5:335-: 05-?-1=97--:8-:45?:3.1=--
B-7?D-:305.?47-::?791:--51=97--: 8-: 9--.8-:
9--950-:6-=56-=58-: 6-=56-=595
1;=-:3-:-7.1=9--73.1=-0-05-?-1=97--: 95 5?:38-49---:-75?-0-71?5:335-: 9
05-?-1=97--:95 571?-451=1-?-:3=-A5?-5 959
0-:6-=56-=595 79 --1.-48-:1?7-859--9510-:37-:
6-=56-=5:D-
7-85 6-=56-=5 95 57- .1=-? =5 05 1=97--:95-0-8-4.1=--7-4.1=-?=505
1=97--:8-:1??1=1.? -0-?5?570-:0581?-77-:?5?579--
1.1-=730-:73 1.-4.1:0-0581?-77-:05 -:?-=-0-: 59-:-7-481?-7.1:0-
73 -3-=3-D-?-=5705:;8-?-:5?197;;=05:-?0-8-9
91?1= -0-?5?570?135?53--9-5501:3-:559
05?19-?7-:.1:0-01:3-:9--
73730-:73 1:?7-:3-D-?-=573=-A5?-5D-:3.171=6--0-.1:0-
D-:3.1=9--73 1:?7-: 1=5;01 1.-4 -?185? 95 D-:3 =-05
;=.5?:D- 11=?53- 6-=-7 -:?-=- 8-: 0-: 95 D-?-7-:6-B-.-::D-0-8-94-=5 -?-=-?-6-=-7
8-:7195-0-8-4H 9
C. Elastisitas dan Gaya Pegas
5:0-?18-491918-6-=552-?52-?.1:0-B-8-:05.-?-5 4-:D--0-B60:D- 1=0--=7-:B60:D-.1:0-05.-3591:6-05?53-
9--9 D-5? -0-? -5= 0-: 3- 1:0--0-?-0-8-4.1:0-D-:391958575.1:?7A;891?1?-1=?-
91958575 52-? 18-?5 -0-8-4
+ + -8-4 -? .1:0- D-:3 91958575 52-? 18-?5 D-:3 7 ?5:335 -0-8-4
7-=1?
Gaya
45
29.6; :2:69686 ?63. 29.?6? 2;1. =.1. 7A4. :2:69686 ?63. =9.?6? D.6A8268.4.D.D.;42827.=.1.2;1.166.1.8.;:.8.2;1.61.8
1.=. 82:.96 82 2;A8 ?2:A9. 63. =9.?6? 6:A9 768. 4.D. D.;4 16268.; :292656 ..? 29.?6?6.? 2;1. 22.=. 0;5 2;1. D.;4
:2:69686 ?63. =9.?6? D.;4 0A8A= 2?. .;.. 9.6; .;.5 92:=A;4 1.; =9.?6?6;
21A. ?63. 29.?6? 1.; =9.?6? 2?2A 16:69686 925 ?26.= 2;1. =.1. 8.; 2.=6 8.1. 821A. ?63. 2?2A A;A8 ?26.= 2;1.
221.21. .2 :2:69686 ?63. =9.?6? D.;4 ?.;4. 2;1.5 1.; ?63. 29.?6?D.;4?.;4.6;4469258.2;.6A8.2?.;4.008164A;.8.;
?2.4.6 .5.; =2:A. .; 82;1...;
1. Tegangan dan Regangan
;A8 9265 :2:.5.:6 29.?6?6.? ?A.A 2;1. =25.68.; , .1.4.:.2?2A2965.?2A.?8.2D.;4:2:69686=.;7.;4
:A9.:A9. .2 2?2A 16.68 12;4.; 4.D. ?22?.
?256;44. 8.2 :2;4.9.:6 =2.:.5.; =.;7.;4 ?22?.
1
268. .68.;;D. 1692=.?8.282:.9682=.;7.;4?2:A9. ;62.68.2:.?652.1.
1.9.: 1.2.5 29.?6?6.?;D. 2:A16.;2?.4.D..68.;=.1.8.216=22?.:2;7.16
1.; 8.2 :2;4.9.:6 =2.:.5.; =.;7.;4 ?22?.
2
268. 4.D. .68.; 1692=.? 2;D.. 8.2 82:.96 82 =.;7.;4 ?2:A9. ;6 2.6 8.2
2?2A 2.1. 1.9.: 1.2.5 29.?6? 26.= 2;1. :2:69686 ..? 29.?6?6.? 22;A 768. 4.D. D.;4 16268.; =.1. 2;1. :292C.6 ..?
29.?6?6.?;D. 2;1. 2?2A .8.; :2;4.9.:6 =2A.5.; 2;A8 123:.?668.2?.4.D..68.;=.1.8.26;616=22?.9.46:2;7.16
:.8. 8.2 .8.; =AA? ;6 2.6 4.D. .68.; =.1. 8.2 29.5 :2;0.=.6 668 =AA?;D. ;A8 9265 729.?;D. ?69.58.; ;1. A9.;46
9.46 :2:.0. 69A?.?6 6;6 ?.:69 :2965. , .9.: =2:.5.?.; :2;42;.6 29.?6?6.? ;1. .8.; :2;2:A8.;
=2;426.; 24.;4.; 1.; 24.;4.; .D. D.;4 2827. =2?.A.;9A.?=2;.:=.;416?2A24.;4.;20..:.2:.6?24.;4.;
1.=. 16A96? ?2.4.6 268A
F H
22.;4.; 24.;4.; ..A ?2?? :
2?. 4.D. .68 9A.?=2;.:=.;4:
2.;16;4.; .;.. =2.:.5.; =.;7.;4 1.; =.;7.;4 :A9.:A9. 16?2A ..A 24.;4.; 20.. :.2:.6? 1.=. 16A96? ?2.4.6
268A H
22.;4.; 24.;4.;
=2.:.5.; =.;7.;4 : =.;7.;4 .C.9 :
F N
m
bata s elastisitas
titik putus
pertambahan panjang gaya
tarik
F
1
F
2
F
3
daerah elastis
.
Gambar 2.17
a Besar gaya tarik F menyebabkan
karet bertambah panjang. b Grafik F – seutas karet yang
ditarik dengan besar gaya F. F
karet ditarik karet
karet
