Kayaknya sudah saya tulis sebelumnya, sekedar menggaris bawahi: Gaya2 itu (F_g , F_1,F_2,F_3) bekerja pada SEMUA benda. Tidak hanya benda2 langit, tapi juga atom2, molekul2. Seperti itulah jika digunakan kerangka acuan bumi, tapi efek F_1, F_2, F_3 bisa diabaikan utk gerak benda2 di laboratorium.
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