I have a question about work. In a lil debate over something related to work.. and my question is, if a car runs over a quarter laying flat on the ground, will the quarter being doing work on the tire? I say yes.. because when the tire rolls over the quarter, it is putting force on the quarter and the quarter is putting force on the tire. As that happens, the quarter displaces the rubber where there is contact.. so wouldn't that be work? My friend says no.. the quarter isn't doing work on the tire because the tire returns to it's original position after it rolls off the quarter.. and since there is no net displacement, there is no work being done. Who is right? Thank you!