SECOND-CLASS LEVERS

• The second-class lever has the output force between the fulcrum and the input force.

• The input and output force are always in the same direction.

The part of the lever between the resistance/load and fulcrum is called the resistance/load arm:

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The part of the lever between the load/resistance and the effort is called the effort arm:

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The closer you move the resistance/load to the fulcrum, the easier it is to lift the load.

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Ideal Mechanical Advantage: the mechanical advantage of a machine with no friction involved

IMA =L in/ L out

L in: Length of the input arm

L out: Length of the output arm

Since in a second-class lever the Length of the input/effort arm is always longer than the output/ load arm, ∴

therefore the Ideal mechanical advantage of a second-class lever is always greater than 1.

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Examples of second-class levers :

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Wheelbarrow

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Nut-Cracker

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Bottle Opener

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