What would be the approximate tensile strength remaining if a rope rated for 1000 pounds develops a knot?

What would be the approximate tensile strength remaining if a rope rated for 1000 pounds develops a knot?

• A. 1000 pounds
• B. 750 pounds
• C. 500 pounds
• D. 250 pounds

Answer: (C)

Tying a knot in a rope introduces localized stress and bending that reduce the rope’s ability to carry load. For many ropes, the presence of a knot cuts the breaking strength by about half, so a rope rated for 1000 pounds would have roughly 500 pounds of usable strength when knotted. The exact amount can vary with knot type, rope material, diameter, age, and how the knot is tied, but the common expectation is a substantial reduction. So 500 pounds is the best approximation for the remaining tensile strength with a knot in a 1000-pound-rated rope.

Tying a knot in a rope introduces localized stress and bending that reduce the rope’s ability to carry load. For many ropes, the presence of a knot cuts the breaking strength by about half, so a rope rated for 1000 pounds would have roughly 500 pounds of usable strength when knotted. The exact amount can vary with knot type, rope material, diameter, age, and how the knot is tied, but the common expectation is a substantial reduction. So 500 pounds is the best approximation for the remaining tensile strength with a knot in a 1000-pound-rated rope.