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# 杠 杆 的 种 类 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about ' 杠 杆 的 种 类' - yuri-dean

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L2

O

L1

F1

F2

L1>L2, 由杠杆的平衡条件F1× L1=F2×L2

F1

F2

L1

L2

O

L1<L2, 由杠杆的平衡条件F1× L1=F2×L2

O

L1

L2

F1

F2

L1=L2, 由杠杆的平衡条件可知F1=F2

①省力杠杆——动力臂比阻力臂长

(特点是省了力但费了距离)

②费力杠杆——动力臂小于阻力臂

(特点是费了力但省了距离)

③等臂杠杆——动力臂等于阻力臂

(特点是使用时不省力也不费力)

L1>L2, 由杠杆的平衡条件可知F1<F2，

F2

O

L2

F1

L1

F1

O

L1

F2

L2

L1<L2, 由杠杆的平衡条件可知F1>F2，