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Gerak Harmonik Sederhana; Ciri Khas GHS; Simpangan (y); Amplitudo (A); Periode dan Frekuensi; Fase dan Sudut Fase; Kecepatan GHS; Percepatan GHS; Energi Potensial GHS; Energi Kinetik GHS; Kekekalan Energi Mekanik; Persamaan Simpangan; Persamaan Kecepatan; Persamaan Percepatan; Diskusi & Analisis

Fisika

Fisika

Gerak Harmonik Sederhana

Agenda Pembelajaran

• Gerak Harmonik Sederhana

• Ciri Khas GHS

• Simpangan (y)

• Amplitudo (A)

• Periode dan Frekuensi

• Fase dan Sudut Fase

• Kecepatan GHS

• Percepatan GHS

• Energi Potensial GHS

• Energi Kinetik GHS

• Kekekalan Energi Mekanik

• Persamaan Simpangan

• Persamaan Kecepatan

• Persamaan Percepatan

• Diskusi & Analisis

Gerak Harmonik Sederhana

Gerak harmonik sederhana adalah gerak bolak-balik suatu benda melalui titik kesetimbangan dengan amplitudo dan frekuensi tetap. Fenomena ini banyak ditemukan dalam kehidupan sehari-hari, seperti pada bandul jam dan pegas.

Gerak harmonik sederhana: Representasi visual melalui struktur spiral.

Ciri Khas GHS

Gerak Harmonik Sederhana (GHS) terjadi karena adanya gaya pemulih yang selalu mengarah ke titik kesetimbangan. Gaya ini berbanding lurus dengan simpangan, tetapi berlawanan arah. Contohnya adalah pegas dan bandul sederhana.

Pegas dengan bola logam menunjukkan gaya pemulih dalam gerak harmonik.

Simpangan (y)

Simpangan (y) adalah posisi benda yang berosilasi diukur dari titik kesetimbangan. Pada Gerak Harmonik Sederhana (GHS), ini menunjukkan seberapa jauh benda bergerak dari posisi stabilnya. Simpangan dapat bernilai positif atau negatif. Nilai maksimumnya disebut amplitudo.

Pendulum hitam menunjukkan simpangan dalam gerak harmonik sederhana.

Amplitudo (A)

Amplitudo adalah simpangan maksimum suatu gelombang atau osilasi dari posisi kesetimbangannya. Ini menunjukkan intensitas atau "kekuatan" getaran. Semakin besar amplitudo, semakin tinggi energi yang dibawa.

Periode (T)

Frekuensi (f)

Periode (T) adalah waktu yang dibutuhkan untuk satu siklus lengkap gerak harmonik sederhana (GHS). Satuan SI-nya adalah detik (s). Bayangkan ayunan bandul: periode adalah waktu dari satu sisi, kembali ke titik awal, dan bergerak ke sisi lain lalu kembali lagi.

Frekuensi (f) adalah jumlah siklus lengkap yang terjadi per satuan waktu. Satuan SI-nya adalah Hertz (Hz), yaitu siklus per detik. Periode dan frekuensi memiliki hubungan timbal balik: f = 1/T atau T = 1/f. Semakin cepat gerakan, semakin tinggi frekuensinya dan semakin pendek periodenya.

Fase dan Sudut Fase

• Fase: Posisi relatif benda pada siklus osilasi.

• Sudut Fase: Nilai sudut penentu posisi.

• Arah gerak ditentukan oleh perubahan fase.

• Penting dalam gelombang dan getaran.

Kecepatan GHS

Pada Gerak Harmonik Sederhana (GHS), kecepatan benda bervariasi. Kecepatan maksimum terjadi saat benda di titik setimbang, sementara kecepatan minimum (nol) tercapai di titik balik (amplitudo). Perubahan ini bersifat sinusoidal, mengikuti posisi benda.

Bola pendulum mengilustrasikan percepatan gravitasi dalam lingkungan kelas.

Percepatan GHS

• Percepatan berbanding lurus dengan simpangan.

• Arah percepatan selalu ke titik setimbang.

• Mencapai maksimum di simpangan terjauh.

• Minimum (nol) di titik setimbang.

Fisika

Gerak Harmonik Sederhana; Ciri Khas GHS; Simpangan (y); Amplitudo (A); Periode dan Frekuensi; Fase dan Sudut Fase; Kecepatan GHS; Percepatan GHS; Energi Potensial GHS; Energi Kinetik GHS; Kekekalan Energi Mekanik; Persamaan Simpangan; Persamaan Kecepatan; Persamaan Percepatan; Diskusi & Analisis

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