as the roughness of something increases , the friction of that something will increase when its surface moves against another surface. Sarah has one piece of wood that is smooth and polished and another that is rough and unfinished. Which of the following is true? ['both pieces of wood will create the same amount of friction', 'the unfinished wood will generate more heat than the other while rubbed over the floor', 'the rough wood will more easily move when rubbed over the tile than the finished wood.', 'the finished wood will generate more heat when it is rubbed back and forth over a tile floor.']