Energi potensial (Ep) : DF = F1 - F2
Catatan : 0 £ F £ 1
jika F = 1 ¾ dapat ditulis F = ¾, sehingga q = 2p.¾ = 270°
jika F = 2 1/3 dapat ditulis F = ¾, sehingga q = 2p.¾ = 270°
Energi mekanis (EM) : F = m.ay
F = - mw².y = -K.y
CONTOH GETARAN HARMONIS
| Energi Kinetik (Ek) Energi Potensial (Ep) Energi Mekanik (EM) | = = = | ½ m.v² = ½ m.w².A² COS² w.t ½ K.y² = ½ m.w².A² sin² w.t Ek + Ep = ½ m.w².A² |
| 1. Bandul Sederhana | 2. Benda tergantung pada pegas |
| Perioda Bandul (T) T = 2p Ö(l/g) Tidak tergantung massa benda Gaya Pemulih (F) F = w sin q | Periode pegas (T) T = 2p Ö(m/k) |
2. Benda tergantung pada pegas
Contoh 1.
Suatu titik materi bergetar harmonis dan menghasilkan energi kinetik sama dengan tiga kali energi potensialnya. Berapakah sudut simpangan pada saat itu ?
Jawab
Ek 3Ep ® ½ mw²A² cos² q = 3. ½ mw²A² Sin²q
[sin q/cos q]² = 1/3 ® tg q = 1/Ö3 ® q = 30°
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