1. The problem statement, all variables and given/known data Water stands at depth d behind a dam of width w . Find an expression for the net force of the water on the dam. Express your answer in terms of the variables w,d,p (density), and appropriate constants. 2. Relevant equations P=F/A or pressure=Force/Area Hydrostatic pressure: p=p_0+pgd 3. The attempt at a solution Fnet=P*A=(pgd)*A =pgd*w*d I guess that p_0 cancels out, because atmospheric pressure is felt both by the dam and the water. Does this make sense?