In tree evaluation, what does "lever arm" refer to?

In tree evaluation, "lever arm" refers to the length of a branch or trunk that contributes to the potential for structural failure. This concept is crucial in understanding how forces such as wind or weight distribution act on a tree. A longer lever arm increases the moment or torque applied to the tree, which can lead to a higher risk of breakage or uprooting. This is particularly important when assessing tree stability and health, as it helps arborists and tree care professionals determine which parts of the tree may need pruning, support, or monitoring.

The concept connects to the mechanics of how trees withstand external forces and provides insight into potential failure points, guiding necessary interventions to maintain tree health and safety.