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Yang Benar, Massa Gula 1kg, Bukan Beratnya 1 Kg.

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"Berat badan saya 60 kg".

Itulah yang sering terucap dari bibir ketika orang menanyakan berapakah berat badan, otomatis bilang "kg" setelah angkanya.



Apakah itu betul??


Mari kita cek..

Membuktikannya kita bisa menggunakan bantuan pelajaran fisika, dimana massa dan berat dibedakan dengan sangat jelasnya.


Massa

Massa adalah salah satu sifat yang besarnya tetap dan tidak pernah berubah walaupun benda ini diletakkan di berbagai tempat.

Dan diukur dengan menggunakan timbangan, serta memiliki satuan "kg".



Ciri-ciri massa :
  • Diketahui besarnya dengan menggunakan timbangan
  • Satuannya "kg"
  • Nilainya tetap walaupun diletakkan diberbagai tempat.



Timbangan yang dipakai beragam dan sering dijumpai pada warung-warung dekat rumah.

Kemudian, besarnya tetap.

Jadi walau dibawa ke negara lain, ke daerah kutub atau bahkan ke planet lain, massa nilainya tidak akan pernah berubah.

Selalu tetap..



Berat

Berat itu satuannya "Newton (N)".

Untuk mendapatkan nilainya, kita memerlukan bantuan dari massa benda plus sentuhan gravitasi bumi atau planet dimana benda ini berada.

Sehingga berat bisa diperoleh dengan mengalikan massa dengan gravitasi.

Rumusnya :

W = m.g
  • W = berat benda (Newton)
  • m = massa benda (kg)
  • g = gravitasi (m/s²)



Ciri-ciri berat:
  • Diperoleh dengan mengalikan massa dan gravitasi
  • Satuannya "Newton (N)"
  • Nilainya berubah-ubah tergantung gravitasi.



Kok nilainya berubah-ubah?

Coba lihat lagi rumus mencari berat, disana ada perkalian dari massa benda dan gravitasi dimana bendanya berada.


  • Kalau dibumi gravitasi kurang lebih 10 m/s², 
  • Sedangkan di bulan gravitasinya seperenam kali dari bumi, atau sekitar 1,67 m/s².


Alhasil berat benda dibulan sangatlah kecil dan jauh lebih ringan dibandingkan ketika benda itu ada dibumi.



Mari kita bandingkan


Misalkan massa sebuah benda 10 kg.

Jika dibumi berat bendanya :

  • W = m. gbumi
    W = 10 kg. 10 kg/s²
    W = 100 N

Jika dibulan :
  • W = m. gbulan
    W = 10 kg. 1,67 m/s²
    W = 16,7 N




    Nah, berat bendanya tidak sama ya, karena dipengaruhi oleh gravitasi dari masing-masing tempat dimana benda itu berada.


    Kesimpulan

    Berdasarkan uraian diatas, sangat jelas kalau yang disebut "berat gula 1 kg" salah, yang benar "massa 1 kg".



    Yang benar adalah massa gula 1 kg.
    • Massa satuannya "kg"
    • Berat satuannya "N" 

    Kalau mau bilang berat gula, mestinya harus dikali lagi dengan gravitasi yang berlaku dibumi, yaitu 10 m/s².

    Sehingga gula yang massanya 1 kg akan memiliki berat :

    W = m.g

    W = 1 kg. 10 m/s²

    W = 10 N.



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