Why are V-belts considered superior to flat belts?

V-belts are considered superior to flat belts primarily because they have a wedge-shaped cross-section that fits into the grooves of a pulley. This design allows V-belts to achieve a strong grip on the pulley, which significantly reduces slippage during operation. As a result, they provide more efficient power transmission, especially under varying load conditions. The prevention of slippage is essential in mechanical systems where consistent performance and reliability are crucial.

Additionally, the design of V-belts helps them maintain better alignment and tension without the risk of coming off the pulley, which enhances their durability and overall effectiveness in machinery. While the other options mention aspects such as cost, weight, and maintenance, these factors do not directly address the fundamental reason for the superiority of V-belts in terms of performance and reliability compared to flat belts.