The amount of friction is designed to be some degree less than the return spring, so that when the pedal is released, it returns to the closed position.

设计时要确保总摩擦力小于折回弹簧的弹力，这样当松开踏板时，弹簧才会弹回，油门才会闭合。

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But the friction (hysteresis) makes it easier to maintain a steady throttle setting, and relieves strain from pushing against the spring continuously.

但摩擦力(滞后作用)可以保证更平稳地完成油门设定，并缓解在持续挤压弹簧过程中产生的张力。

youdao

This always applies both for conservative forces, like gravitational and spring forces, but it also holds for nonconservative forces such as friction.

适用于保守力，像重力和弹力，对非保守力同样，适用，如摩擦力。

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