NFPA 1006 Office Of The Fire Marshal (OFM) Practice Test

In a direct pull haul system how much force is necessary to raise a 100-lb load?

100 lbs of force 25 lbs of force 33 lbs of force 40 lbs of force

Correct Answer:

100 lbs of force

Explanation:

In a direct pull haul system there is no mechanical advantage from pulleys or tackles. The force you apply to lift the load must match the load’s weight (ignoring friction). So for a 100-lb load, you must apply about 100 pounds of force to raise it. In real life, friction and inefficiencies can require a bit more, but the ideal calculation used here is equal to the load weight.

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