Which method is commonly used to reduce friction when lifting?

Using pulleys or rollers is a standard method for reducing friction in lifting operations. Pulleys change the direction of force and can help distribute the load more evenly, making it easier to lift. Rollers, similarly, allow an object to roll rather than being dragged, which minimizes friction against surfaces. This reduction in friction leads to increased efficiency and less wear on equipment, allowing for smoother operation and better control during lifting tasks.

Other methods, like employing a heavier weight or changing the load type, do not inherently address friction. The weight may alter how the load is handled but does not impact the frictional forces at play between the load and the surfaces they encounter. Shortening the rigging line may actually increase friction by creating a tighter angle or curve in the line, thus increasing resistance rather than alleviating it. Therefore, using pulleys or rollers is the most effective and widely accepted method for minimizing friction during lifting.