Question

A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 1.50 m, and the distance from the fulcrum to the load is 0.300 m. A graph of resistive force vs. effort force is shown. What is the mechanical advantage of the lever? What is the ideal mechanical advantage of the lever? What is the efficiency of the lever? Show your work.

Answer 1

So, the required efficiency is 25%.

Given

Distance of the applied force from the fulcrum=2.00 m

Distance from the fulcrum to the load =0.500 m

Mechanical advantage:

Mechanical advantage is a form of calculation that measures the amplified force taken by the mechanical system. It gives the ratio between the force applied to the load and the force needed to overcome the given force.
The formula of mechanical advantage is given as: MA = FB/FA

Now, substituting the given values into the above formula

MA = 0.500/2 = 0.25

Now, the ideal mechanical advantage will be efficiency MA/IA = 0.25/1 = 25