Work input.
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The IMA of a machine is greater than 1 whenever the output force is greater than the input force.
Mechanical advantage is a measure of leverage, essentially and = distance moved at input end / distance moved at output end, but the work done ( force* distance ) at each end is the same except there will be the inevitable friction losses inbetween,The efficiency of a machine is work done at output / work done at input and can never exceed 100 %
never
no never 9 is a positive so it is always greater
Efficiency as a percent is output/input * 100%12000/15000 * 100% = 80% efficiency which makes sense, because it takes more work (input) than it give out (output). So the efficiency should be less than 100%.