To calculate the pulley’s efficiency, the student can divide the output work (the work done in lifting the log) by the input work (the work put in to pull the rope), and then multiply by 100 to get a percentage. Efficiency shows how well the pulley transfers energy from the effort to the load.
A student uses a pulley to lift a log. In 1–2 sentences, explain how she can calculate the pulley’s efficiency.
Make it in a sentence and like a 9th grader.
1 answer