NEIEP Mechanics Practice Exam

How do you determine the correct angle from the vertical for placing a ladder?

1. Measure a distance equal to the height of the ladder

2. Measure out a distance of 1/3 the height

3. Measure out a distance of 1/4 the height

4. Measure out a distance of half the height

The correct answer is: Measure out a distance of 1/4 the height

To determine the correct angle from the vertical for placing a ladder, the method involves establishing a safe and stable position that reduces the risk of slipping or falling. The ideal practice is to measure out a distance of one-fourth the height of the ladder from the base of the wall or surface the ladder leans against. This approach ensures that the angle formed is adequate for safe climbing and stability. The one-fourth rule comes from recommendations based on safety standards, where the optimum angle is approximately 75 degrees from the ground. This angle provides a good balance between stability and reach. By measuring out a distance that is one-fourth of the ladder's height, you can ensure that the base is far enough away to achieve that angle while still being close enough to maintain effective control of the ladder. Measuring different distances, such as a distance equal to the height of the ladder or more excessive ratios, could lead to a dangerously steep angle, increasing the risk of the ladder tipping over or becoming unstable. Conversely, measuring out distances smaller than one-fourth might place the ladder too close, which can be unsafe as it would require a more acute angle that compromises the user's balance and control.