How can you calculate the efficiency of a simple machine?

To calculate the efficiency of a simple machine, you take into account the work that is put into the machine (input work) versus the work the machine does (output work). Efficiency is a measure of how well a machine converts input energy into useful output energy or work.

The formula used is Efficiency = (Output Work / Input Work) × 100%. This formula provides a percentage that indicates how effectively the machine is performing compared to the amount of work being done on it. A higher efficiency percentage means that a greater proportion of input work is being converted into useful output work, which is typically the desired outcome in using simple machines.

The other options presented do not accurately represent efficiency in the context of simple machines. For example, output power divided by input power measures power efficiency but is not the same as calculating work efficiency.