Place a hardcover book flat on a horizontal table with its cover facing you.Put a quarter flat on the book's cover.Slowly raise one end of the book by half centimetre amounts from the table's surface and note whether the coin slides down the book tow
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Place a hardcover book flat on a horizontal table with its cover facing you.Put a quarter flat on the book's cover.Slowly raise one end of the book by half centimetre amounts from the table's surface and note whether the coin slides down the book tow
Place a hardcover book flat on a horizontal table with its cover facing you.Put a quarter flat on the book's cover.Slowly raise one end of the book by half centimetre amounts from the table's surface and note whether the coin slides down the book towards the table.
Place a hardcover book flat on a horizontal table with its cover facing you.Put a quarter flat on the book's cover.Slowly raise one end of the book by half centimetre amounts from the table's surface and note whether the coin slides down the book tow
把一本硬皮书平放在水平的桌子上,封面朝着你.把一个25分硬币（1/4美元）平放在书的封面上.慢慢的把书的一端从桌面抬起,每次增加半厘米,注意硬币是否从书上滑落向桌子.
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中间有两个单词应该错了。意思是：将一本硬壳封面的书平放在水平桌面上，正面朝上，在封面的上端平放一块硬币，依次缓慢地将书的这头抬高到离桌面不同的几厘米高，记录硬币是否沿封面下滑（应该是探究动摩擦因数的实验）如果硬币下滑了， 它的原理是什么呢...
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中间有两个单词应该错了。意思是：将一本硬壳封面的书平放在水平桌面上，正面朝上，在封面的上端平放一块硬币，依次缓慢地将书的这头抬高到离桌面不同的几厘米高，记录硬币是否沿封面下滑（应该是探究动摩擦因数的实验）
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