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15 July, 19:14

Which would have the lowest input force?

A short lever with a large fulcrum

A long lever with the fulcrum as far as possible from the load

A Short lever with the fulcrum as close as possible to the load

A long lever with the fulcrum as close as possible to the load

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  1. 15 July, 19:40
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    A long lever with the fulcrum as close as possible to the load

    Explanation:

    If F be the effort, W be the weight, L₁ be the distance of load from fulcrum and L₂ be the distance of effort from the fulcrum,

    Taking moment of force about the fulcrum, we have

    W x L₁ = F x L₂

    F = W x (L₁ / L₂)

    F will be minimum when L₁ will be minimum.

    Hence fulcrum should be as close as possible to the load.
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