铡刀铡草时的示意图如图所示，请作出作用在铡刀上的动力F1、阻力F2的力臂
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延长动力作用线，过支点O作动力作用线的垂线段（即动力臂L1）；阻力垂直于杠杆，且与杠杆交于点A，则阻力臂为线段OB；如图所示绛旓細娌縁 1 浣滃嚭鍔ㄥ姏鐨勪綔鐢ㄧ嚎锛屼粠O鐐瑰悜鍔涘姩鍔汧 1 鐨勪綔鐢ㄧ嚎寮曞瀭绾匡紝鍗充负鍔ㄥ姏鑷侺 1 锛屽鍥撅細 閾″垁鍙楀埌鐨勯樆鍔汧 2 鐨勪綔鐢ㄧ偣鍦ㄧ墿浣撲笌閾″垁鎺ヨЕ澶勶紝鏂瑰悜鍨傜洿閾″垁鏂滃悜涓婏紝鎵浠ラ樆鍔汧 2 鐨勭ず鎰忓浘濡傚浘锛 濡傚浘锛
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