题干

锤子的锤头变松了,只要把锤柄的一端在水泥地面上撞击几下,锤头就牢牢地套在锤柄上了,请用所学的物理知识解释这是为什么?

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答案(点此获取答案解析)

答:斧头原来是和斧柄一起向下运动的,当斧柄因撞击而突然停止时,斧头由于惯性,仍要保持原来的运动状态继续向下运动,所以斧头就紧紧地套在斧柄上了.

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