I'm asked: "An object is moving along a floor at constant velocity. Thinking about this situation as realistically as possible, is work being done on the object?"
And the solution is: "Work is being done on the object. To move at a constant velocity, a force must be pushing the car so as to overcome friction, air resistance, etc."
However, since work is defined as $W = F · x$, and $F = ma$, wouldn't work be zero? Because acceleration is zero, and hence the sum of the forces acting on the object is zero, and hence the dot product of F and x is zero?
Or do we count work even when it is cancelled out y equal and opposite work?
EDIT: I can see that the frictional force is not doing any work (since the object is not moving in the direction of the friction) but that the push-force IS doing work, since the object is saying in the same direction.
However, the net force on the object is still $0$. So I understand that we can attribute work to the push-force -- but is the object experiencing any OVERALL work? How is this possible if acceleration is $0$?