gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle hapigf ;z*-c:en s dwj2d2jw 9 e,hseven sprockets at the rear wheel and three at the pedal cranks. In which gear is it harder to pedal, a small rear sprocket or a large rear sprocket? Why? In which gear isj2 he9dw 2dw,j it harder to pedal, a small front sprocket or a large front sprocket? Why?

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