How does the friction at fulcrum affect the mechanical advantage of a lever?

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Solution

Mechanical advantage of the lever is equal to the ratio of effort arm to the load arm.

𝑀𝑒𝑐ℎ𝑎𝑛𝑖𝑐𝑎𝑙 𝑎𝑑𝑣𝑎𝑛𝑡𝑎𝑔𝑒 𝑜𝑓 𝑙𝑒𝑣𝑒𝑟
$= \frac{L o a d}{E f f o r t}$ $= \frac{E f f o r t a r m}{L o a d a r m}$

Effort needed to balance the load increases due to friction at fulcrum, and hence mechanical advantage decreases.

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Similar questions

The lever for which the mechanical advantage is less than 1 has the :

(a) fulcrum at the midpoint between the load and effort.

(b) load between the effort and fulcrum.

(d) load and effort acting at the same point.

The given figure shows a weightless lever in equilibrium. Neglect friction at the fulcrum F.

Calculate the mechanical advantage for the given lever.

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