Question

why is work output always less than work input? because friction or other forces oppose the effort force resulting in less efficiency because work input does not affect work output

Explanation:

Work output is always less than work input because of non - ideal conditions. In real - world scenarios, forces like friction act against the effort force. According to the work formula \(W = F\times d\) (where \(W\) is work, \(F\) is force, and \(d\) is distance), when there is an opposing force (e.g., friction \(F_f\)), the net force available to do useful work (output work) is less than the applied force (input work). The efficiency of a machine is given by \(\eta=\frac{W_{output}}{W_{input}}\times100\%\), and since \(\eta< 100\%\) (except in ideal, friction - less cases which do not exist in reality), \(W_{output}

Answer:

because friction or other forces oppose the effort force resulting in less efficiency