Friction: a force between an object and the surface it is moving over Imagine you push a book across an incredibly slippery surface. It slides right across because there is NO friction. Next, you push the same book across a rougher surface that exerts friction.

1.)Will the velocity of the book change as it moves across the surface with NO friction? Explain your answer.

2.)Will the velocity of the book change as it moves across the surface WITH friction? Explain your answer.