At 11:00 eastern time, a Cessna 172P overran the runway and flipped while landing at Concord Municipal Airport. The instructor, student pilot and passenger were not injured. The ASOS reported winds as calm and braking as fair. The student was practicing landings on runway 35 when the instructor called for a simulated engine out landing. The student entered the downwind leg for runway 12 but would not properly descend or decelerate. When the airplane finally landed 1,000 feet down the runway, it began to slide sideways, with little brake effectiveness. In fact, the winds at the time of the accident were from 320 degrees at 8 knots.