Physical Science: Efficiency Quiz

The amount of work obtained from a machine is always less than the amount of work put into it. This is because some work is lost due to friction. The efficiency of a machine is determined using the following formula: (work output/work input) * 100
Efficiency is always a percentage and can never be 100% due to friction. For this quiz, you will need a scrap sheet of paper, pencil and a calculator. Select the best choices from the responses. Good luck!!