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簡單機械1.杠杆:一根在力的作用下能繞著固定點轉動的硬棒就叫杠杆.2.什麼是支點、動力、阻力、動力臂、阻力臂?(1)支點:杠杆繞著轉動的點(o)(2)動力:使杠杆轉動的力(F1)(3)阻力:阻礙杠杆轉動的力(F2)(4)動力…
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