本题目来源于试卷: gc textbook chapter 8 Rotational Motion，类别为 IB物理学
[问答题]
A 21-speed bicycle has sevenx.h7gjhfq41:etz/ 7c fr tr3f sprockvl kz5d:0 f-jxv+bu/r ets 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 is it harder to pedal, a small front sprocket or a large front sproc-:5/zduvk f+jvx lr0b ket? Why?
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