本题目来源于试卷: gc textbook chapter 8 Rotational Motion，类别为 通用国际物理
[问答题]
A 21-speed bicycle has 85(ho*6p kf oq h8obu.c4gfolb0y3 ;en akk*yseven 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 wyky0*b 3anke ;hich gear is it harder to pedal, a small front sprocket or a large front sprocket? Why?
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