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# Pesawat Sederhana

Materi Pesawat Sederhana Kelas 8 Sekolah Mutiara Bunda
by

## Okky Fajar Trimaryana

on 2 October 2013

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#### Transcript of Pesawat Sederhana

Oleh : Okky Fajar Trimaryana
Pesawat Sederhana
"Setiap alat yang mempermudah manusia dalam melakukan usaha"
4 Macam Pesawat Sederhana :

- Tuas
- Katrol
_ Bidang Miring
- Roda Gigi/gir
Tuas,

Prinsip nya :

F x lk = W x lb

Keuntungan Mekanis (KM) =

w/F atau lk/lb
Ket. :
F = Kuasa (Gaya oleh manusia)
lk = Lengan Kuasa
W = Beban
lb = Lengan beban
Tuas kelas I : (Beban-Titik Tumpu-tuas)

- Linggis
- Gunting
- Tang
- pembuka kaleng
Tuas Kelas Ke-II (Titik tumpu-Beban-Kuasa)

- Gerobak dorong beroda satu
- Catut
- Pembuka botol
- Stapler
Tuas kelas ke-III (Beban-Kuasa-Titik tumpu)

- Pancingan
- sapu
Katrol :

-Katrol Tunggal Tetap

-Katrol Tunggal Bergerak

-Sistem katrol
Katrol Tunggal Tetap :

KM ; 1
Katrol Tunggal begerak

KM = lk/lb = 2
Sistem Katrol :

KM = Banyaknya Katrol/tali yang menanggung beban
Bidang Miring

KM = Panjang Lintasan/Tinggi
Berlaku Kekekalan Usaha :

"Usah Masukkan = Usaha Keluaran"
Contoh :
Baji, Pisau, Kapak, Sekrup
Roda Gigi/Gir

"Ingat konsep ganti gigi pada sepeda"
Full transcript