[ Physics ] Open Question : Quick question.... (20char)?
I was on the bus today. One of my classmates dropped a textbook just as the bus stopped, and it slid on the floor, down the isle to the front of the bus. Apologizing vaguely, he said: "Sorry....Just....Gravity...." And I thought: Wait. That's not right is it? Gravity made his book drop but it was working *against* moving to the front of the bus... I just wondered, what would have been the most correct thing to say? "Sorry....Friction...." But no, that's not it either. What would have been right?
Source: http://answers.yahoo.com/question/index?qid=20120912165925AAlurR9