why is that if you drop a text book and a pen down on the floor;they both hit the floor at the same time but if you drop a pen and a sheet of paper its a different story?

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because the pen has more mass then the piece of paper.  

When you drop a pen and a text book, they are larger objects and are not affected by air resistance. When you drop a pen and a sheet of paper, the paper is being strongly influenced by air resistance since it has a high surface area and small mass. In a vacuum with no air, both objects would fall at the same rate (9.8 m/s^2) and so would all other objects. Here is a video that explains this. http://www.youtube.com/watch?v=akWo3QpiL2I

Because a pen has more mass than the paper and the paper is affected by air resistance.

Because the pen and text book are affected by gravitys weight. But the paper isnt affected by it so it drops down more slowly