What is the relationship between weight and arm in calculating moment?

The relationship between weight and arm in calculating moment is defined by the formula for moment, which is calculated as the product of weight and arm. The arm refers to the distance from a reference point (usually the center of gravity) to the point of application of the weight. By multiplying the weight (which acts downwards due to gravity) by the arm (the horizontal distance from the reference point), you obtain the moment, which reflects the tendency of a force to cause rotation about that point.

The concept of moment is critical in aviation, particularly when considering load distributions and the aircraft's center of gravity. Maintaining proper balance is essential for safe flight, and understanding how weight and arm contribute to moment helps pilots and engineers ensure that the aircraft performs as expected.

In terms of the other choices, weight is indeed a significant factor in determining moment, and the moment cannot solely depend on the arm. Moment also cannot simply be derived from summing the arms or disregarding weight, as both components are essential to derive an accurate measurement of moment in aviation practice.