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Sumber : en.wikipedia.org
BAB 2
ELASTISITAS ZAT PADAT
Sifat benda
Elastis Plastis
 Elastis / elastisitas adalah
kemampuan suatu benda
untuk kembali ke bentuk
awalnya segera setelah
gaya luar yang diberikan
kepada benda itu
dihilangkan (dibebaskan).
A. ELASTISITAS ZAT PADAT
 Plastis adalah sifat benda
yang tidak mampu
kembali ke bentuk semula
setelah gaya luar yang
diberikan kepada benda
itu dihilangkan /
dibebaskan.
 Tegangan (σ) merupakan hasil bagi antara gaya tarik F
yang dialami kawat dengan luas penampangnya (A).
 Secara matematis ditulis:
 Tegangan adalah besaran skalar, dengan satuan N/m2
atau pascal.
A
F


A. ELASTISITAS ZAT PADAT
Tegangan
 Regangan (e) merupakan hasil bagi antara pertambahan
panjang 𝚫L dengan panjang awal L.
 Secara matematis ditulis:
 Regangan tidak memiliki satuan atau dimensi.
L
L
e


A. ELASTISITAS ZAT PADAT
Tegangan
A. ELASTISITAS ZAT PADAT
Grafik Tegangan Terhadap Regangan
 O – A : berlaku hukum Hooke.
 O – B : jika tegangan dihilangkan, kawat akan kembali
ke bentuk awalnya.
 C : benda dapat kembali namun tidak ke bentuknya semula.
 D : benda tidak dapat kembali ke bentuknya semula.
 E : kawat akan patah
A. ELASTISITAS ZAT PADAT
Grafik Tegangan Terhadap Regangan
 Modulus elastisitas (E) merupakan perbandingan antara tegangan
dan regangan yang dialami bahan.
 Secara matematis ditulis:
atau
 Modulus elastis memiliki satuan N/m2 atau pascal.
 Modulus elastisitas tergantung oleh jenis zat, dan tidak tergantung
oleh ukuran atau bentuknya.
e
E


L
L
E
A
F 

A. ELASTISITAS ZAT PADAT
Modulus Elastisitas
A. ELASTISITAS ZAT PADAT
Modulus Elastisitas
Ayoo Berlatih Secara Mandiri
1. Tali nilon berdiameter 2 mm ditarik dengan gaya 100 Newton. Tentukan
tegangan tali!
2. Seutas tali mempunyai panjang mula-mula 100 cm ditarik hingga tali
tersebut mengalami pertambahan panjang 2 mm. Tentukan regangan
tali!
3. Suatu tali berdiameter 4 mm dan mempunyai panjang awal 2 meter
ditarik dengan gaya 200 Newton hingga panjang tali berubah menjadi
2,02 meter. Hitung (a) tegangan tali (b) regangan tali (c) modulus
elastisitas Young!
4. Seutas tali nilon berdiameter 1 cm dan panjang awal 2 meter mengalami
tarikan 200 Newton. Hitung pertambahan panjang senar tersebut! E
nilon = 5 x 109 N/m2
5. Tiang beton mempunyai tinggi 5 meter dan luas penampang lintang 3
m3 menopang beban bermassa 30.000 kg. Hitunglah (a) tegangan tiang
(b) regangan tiang (c) perubahan tinggi tiang! Gunakan g = 10 m/s2.
Modulus elastis Young Beton = 20 x 109 N/m2

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Elastisitasitas

  • 1. Sumber : en.wikipedia.org BAB 2 ELASTISITAS ZAT PADAT
  • 3.  Elastis / elastisitas adalah kemampuan suatu benda untuk kembali ke bentuk awalnya segera setelah gaya luar yang diberikan kepada benda itu dihilangkan (dibebaskan). A. ELASTISITAS ZAT PADAT  Plastis adalah sifat benda yang tidak mampu kembali ke bentuk semula setelah gaya luar yang diberikan kepada benda itu dihilangkan / dibebaskan.
  • 4.  Tegangan (σ) merupakan hasil bagi antara gaya tarik F yang dialami kawat dengan luas penampangnya (A).  Secara matematis ditulis:  Tegangan adalah besaran skalar, dengan satuan N/m2 atau pascal. A F   A. ELASTISITAS ZAT PADAT Tegangan
  • 5.  Regangan (e) merupakan hasil bagi antara pertambahan panjang 𝚫L dengan panjang awal L.  Secara matematis ditulis:  Regangan tidak memiliki satuan atau dimensi. L L e   A. ELASTISITAS ZAT PADAT Tegangan
  • 6. A. ELASTISITAS ZAT PADAT Grafik Tegangan Terhadap Regangan
  • 7.  O – A : berlaku hukum Hooke.  O – B : jika tegangan dihilangkan, kawat akan kembali ke bentuk awalnya.  C : benda dapat kembali namun tidak ke bentuknya semula.  D : benda tidak dapat kembali ke bentuknya semula.  E : kawat akan patah A. ELASTISITAS ZAT PADAT Grafik Tegangan Terhadap Regangan
  • 8.  Modulus elastisitas (E) merupakan perbandingan antara tegangan dan regangan yang dialami bahan.  Secara matematis ditulis: atau  Modulus elastis memiliki satuan N/m2 atau pascal.  Modulus elastisitas tergantung oleh jenis zat, dan tidak tergantung oleh ukuran atau bentuknya. e E   L L E A F   A. ELASTISITAS ZAT PADAT Modulus Elastisitas
  • 9. A. ELASTISITAS ZAT PADAT Modulus Elastisitas
  • 10. Ayoo Berlatih Secara Mandiri 1. Tali nilon berdiameter 2 mm ditarik dengan gaya 100 Newton. Tentukan tegangan tali! 2. Seutas tali mempunyai panjang mula-mula 100 cm ditarik hingga tali tersebut mengalami pertambahan panjang 2 mm. Tentukan regangan tali! 3. Suatu tali berdiameter 4 mm dan mempunyai panjang awal 2 meter ditarik dengan gaya 200 Newton hingga panjang tali berubah menjadi 2,02 meter. Hitung (a) tegangan tali (b) regangan tali (c) modulus elastisitas Young! 4. Seutas tali nilon berdiameter 1 cm dan panjang awal 2 meter mengalami tarikan 200 Newton. Hitung pertambahan panjang senar tersebut! E nilon = 5 x 109 N/m2 5. Tiang beton mempunyai tinggi 5 meter dan luas penampang lintang 3 m3 menopang beban bermassa 30.000 kg. Hitunglah (a) tegangan tiang (b) regangan tiang (c) perubahan tinggi tiang! Gunakan g = 10 m/s2. Modulus elastis Young Beton = 20 x 109 N/m2