扭矩
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定义
力的旋转等效量，等于施加的力乘以到支点的垂直距离，以牛顿米（N·m）或磅英尺（lb·ft）为单位。
解释
A 20 N force applied 0.5 m from a bolt produces 10 N·m of torque. Car engine torque—typically 200–600 N·m for passenger vehicles—determines acceleration feel at low speeds, while horsepower governs top-end performance. Torque wrenches allow fasteners to be tightened to precise specifications, preventing both under-tightening (joint failure) and over-tightening (stripped threads).
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