greasing a surface helps reduce friction
mechanical efficiency is the percent of the energy that you put into a machine that was transferred to the load.
Mechanical efficiency = (output energy)/(input energy) . It's typically stated as a percentage.
The mechanical efficiency of this machine is 30 percent.
Efficiency= Mechanical Advantage Speed ratio X100 Mechanical advantage divided by speed radio X (times) 100
Mechanical efficiency
Efficiency of a machine or mechanical advantage
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Efficiency % = (Output/Input) x 100
mechanical efficiency is the percent of the energy that you put into a machine that was transferred to the load.
Mechanical Efficiency is the ratio of Actual mechanical advantage to ideal mechanical advantage.Efficiency will be maximum when Actual mechanical advantage equals that of ideal.But practically not possible.Actual mechanical advantage will be less due to friction,heat,deflection etc.avoiding these loses will increase the machine efficiency.
Sounds like you are asking about "mechanical advantage"...