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A flexible connector passes over a frictionless pulley and changes direction. What happens to the tension it carries?
AIt falls to zero at the pulley and rebuilds afterwards
BIt is halved at the pulley, and the direction changes
CIt is doubled at the pulley, and the direction changes
DIt is transmitted undiminished, only the direction changes
Answer & Solution
Correct answer: D. It is transmitted undiminished, only the direction changes
1. Flexible connectors are often used to transmit forces around corners.
2. With no friction present, the tension is transmitted undiminished.
3. Only the direction of the tension changes, and it stays parallel to the connector.
4. Tendons in a finger and a bicycle brake cable both work this way.
_Source: OpenStax College Physics (CC BY 4.0), Ch 4 "Dynamics: Force and Newton's Laws of Motion", section 4.5 Normal, Tension, and Other Examples of Forces_
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