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Seorang beratnya 600 N menaiki lift. Apabila g = 9,8 m/s² dan lift bergerak turun dengan percepatan 2 m/s², berat orang saat bergerak turun adalah …

Seorang beratnya 600 N menaiki lift. Apabila g = 9,8 m/s² dan lift bergerak turun dengan percepatan 2 m/s², berat orang saat bergerak turun adalah …

Untuk soal ini jawaban yang benar adalah 477,55 N.

Diketahui:
w = 600 N
g = 9,8 m/s²
Lift bergerak turun
a = 2 m/s²

Ditanya:
w’ = …?

Jawab:
Konsep yang kita gunakan adalah penerapan hukum II Newton pada kehidupan sehari-hari.
Hitung massa orang terlebih dahulu.
w = m x g
m = w/g
m = 600/9,8
m = 3.000/49 kg.

Ketika kita menaiki lift yang sedang bergerak turun, maka akan terdapat perbedaan berat tubuh. Hal ini dikarenakan lift memiliki percepatan tertentu saat bergerak. Hukum II Newton pada kasus ini dituliskan sebagai:
ΣF = m x a
w – N = m x a
N = w – (m x a).
N = 600 – [(3.000/49) x 2] N = 600 – (6.000/49)
N = 23.400/49
N = 477,55 N.

Oleh karena itu, berat orang saat bergerak turun adalah 477,55 N.

Semoga membantu ya!

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