The stress on a sheave or block varies with the degree of angle between the lead and load lines. When the two lines are parallel, 1000 pounds on the lead line results in a load of 2000 pounds on the hook. As the angle between the lines increases, the stress on the hook is reduced as illustrated below.
To determine the stress on a hook, multiply the pull on the lead line by a suitable factor from the following table. All loads shown ignore frictional losses in the system.
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