Question

If each object in the universe attract every other object why don't you 2 book kept in a table come towards each other and collide

Answer 1

because attraction between both is very very low in magnitude

Answer 2

Answer: This is because the earth gravitation acting on those books.

Explanation: we know that there could be microgravity present in the space, I hope you would be knowing about space-time fabric present in the space which helps the objects present in the space to revolve around (less massive objects revolve around the massive object).  

so, gravity helps in colliding the object together and there is no gravity in space and on earth when the object comes in contact with any surface the gravity stops at that time,that is why when the two books are kept on the table they are at the surface of the table therefore, gravity stops and object remain stationary.