Final answer:
During a deadlift attempt, if a lifter intentionally drops the bar to the floor, the correct ruling is to disqualify the attempt and warn the lifter.
Step-by-step explanation:
During an attempt on the deadlift, when a lifter intentionally drops the bar to the floor, the correct ruling would be to disqualify the attempt and warn the lifter according to the International Powerlifting Federation (IPF) rules.
In powerlifting competitions, intentionally dropping the bar is considered a violation. The lifter is expected to control the descent of the bar and release it smoothly without dropping it.
If a lifter intentionally drops the bar, it is typically seen as unsportsmanlike conduct, which results in a warning and disqualification of the attempt. This serves as a reminder to the lifter to abide by the rules and perform the lift properly.