Answer :
Final answer:
Frictional drag enables rescuers to safely and efficiently move victims up and down stairways or inclines. This force is less than the weight of the load being moved and can be adjusted to keep the victim's movement smooth and minimally straining for the rescuer.
Explanation:
The type of drag that enables a rescuer to move the victim up or down a stairway or incline is referred to as frictional drag. By this type of drag, the force needed to move a rescuer and their load (the victim) is less than the actual weight of the total load. When descending a stairway or an incline, gravity assists the rescuer in moving the load downwards, whereas when ascending, it works against the rescuer. Frictional drag enables a smoother and less labor-intensive movement of the victim, thus ensuring their safety and well-being during the potentially dangerous process. For instance, when a firefighter is pulling a victim from a building, the force in the ropes utilized is less than the actual weight of the victim. This is due to the vertical rope supporting a large part of the victim's weight. Similarly, when the ski patrol lowers a rescue sled and victim with a total mass of 90.0 kg down a 60.0⁰ slope at constant speed, the sled's friction with the snow serves as this frictional drag, enabling a controlled and safe descent.
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