At 09:30 CDT, a Cessna 172D suffered a hard landing following an aborted takeoff from a grass airstrip near Jonesboro. The four people aboard were not injured. The pilot reported that she had planned a local orientation flight for three EAA Young Eagles. The pilot said the takeoff roll was slightly longer than expected and that, at approximately 20 to 25 feet agl, she became concerned that the airplane might not be able to clear the power lines at the departure end of the airstrip. She elected to abort the takeoff, and the airplane landed hard on the left side of the runway. A mechanic noted that the aircrafts propeller had been recently changed from a climb prop to a cruise prop.