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11.3杠杆（第3课时）1一、杠杆的分类根据杠杆平衡条件，动力臂大于阻力臂时，动力________阻力；动力臂小于阻力臂时，动力__________阻力。（选填大于、等于、小于）。所以：动力臂___________阻力臂的杠杆叫做省力杠杆；动力臂___________阻力臂的杠杆叫做费力杠杆；动力臂___________阻力臂的杠杆叫做等臂杠杆。小于大于大于小于等于1.杠杆分类原则2.各类杠杆的特点省力杠杆的特点：_____________________费力杠杆的特点：___...
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