皮皮学，免费搜题
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【简答题】
做了一个如图甲所示的小实验, A 是一根一端固定的橡皮筋,另一端用细绳绕过一个滑轮连着一个 B ,在中逐渐增加小石子,用同样大小的力弹橡皮筋就能弹出不同的声音。请你解释: ( 1 )这些声音的主要区别是 不同,声音有这些区别的原因是 。 ( 2 )用这个装置还可以完成如图乙、丙所示实验,弹簧测力计和细线的重力及一切摩擦不计,和石 子总重 G = 1N ,则图乙、丙中弹簧测力计 A 和弹簧测力计 B 的示数分别为 、 ;这个 实验中滑轮的作用是 。
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