According to the pilot, he put the airplane into a forward slip on the final leg of the traffic pattern in order to descend onto the runway; the airplane bounced once upon contact and settled. He noticed the airplane was positioned slightly to the right of the centerline and was unsuccessful in his attempts to apply left rudder; unaware if the passenger (seated in the front) was blocking the right rudder pedal or if the passenger had applied the right rudder to maneuver the airplane back onto the centerline. The airplane veered to the right, and the left wing tip made contact with the runway before the airplane departed the right side of the runway and came to rest in a grassy area. The damage was substantial to the left wing and the fuselage. The pilot reported no mechanical malfunctions or failures with the airplane that would have precluded normal operation.