Is friction created when a rope passes through a sheave?

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Multiple Choice

Is friction created when a rope passes through a sheave?

Friction will be created between the rope and the sheave because the rope stays in contact with the wheel’s surface as it passes over it. That contact resists the rope’s motion and alters the tension along the rope. In many training scenarios, a rough, practical estimate used is about a 10% friction effect when a rope wraps around a standard sheave under normal conditions. So the best choice reflects that friction does occur, and a typical rule-of-thumb value around 10% is applied. If you needed a precise value, you’d use the belt-friction concept involving the coefficient of friction and the wrap angle, but the exam-style answer uses the 10% figure as the common estimate.

Friction will be created between the rope and the sheave because the rope stays in contact with the wheel’s surface as it passes over it. That contact resists the rope’s motion and alters the tension along the rope. In many training scenarios, a rough, practical estimate used is about a 10% friction effect when a rope wraps around a standard sheave under normal conditions. So the best choice reflects that friction does occur, and a typical rule-of-thumb value around 10% is applied. If you needed a precise value, you’d use the belt-friction concept involving the coefficient of friction and the wrap angle, but the exam-style answer uses the 10% figure as the common estimate.

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