What defines compound systems in rope rescue?

In rope rescue, compound systems are defined as systems that consist of one simple system pulling on another. This configuration allows for the leveraging of forces applied through multiple simple mechanical advantage systems that work together to accomplish a task, such as lifting or lowering a load. By utilizing a compound system, rescuers can multiply their lifting capabilities, distributing workloads effectively between different components of the system.

For example, a compound system might involve a primary haul system being assisted by a secondary system that increases the overall mechanical advantage. This collaboration between systems allows for greater efficiency, especially in challenging rescue scenarios where substantial weight or resistance is involved.

In contrast, the other choices illustrate different aspects of rope rescue systems but do not accurately reflect the definition of compound systems. While multiple anchors can be part of a rescue setup, they do not define a compound system. Similarly, relying solely on friction techniques limits the function of a compound system, which is to combine systems rather than just focusing on frictional elements. Lastly, while block pulleys are vital tools within rope rescue, specifying that a system uses only block pulleys does not encompass the broader concept of compound systems, which can involve various mechanical components beyond just pulleys.