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18. Sebuah katrol bebas digunakan untuk mengangkat muatan dengan massa 20 kg. Berapa
besar gaya minimal yang dikerjakan pada katrol tersebut untuk mengangkat beban?
Jelaskan.
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19. Jelaskan pengertian dari katrol majemuk.
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20. Gambarkan contoh diagram sederhana dari katrol majemuk yang terdiri atas 4 katrol
lengkap dengan keterangannya.
21. Tuliskan persamaan matematis keuntungan mekanis katrol majemuk.
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