Efficiency – Quiz Questions


pp. 459 - 461


  1. What is a perpetual motion machine?

  2. Define the word “EFFICIENCY.”

  3. What is the formula for efficiency?

  4. Efficiency is measured in what unit?

  5. Why is no machine 100% efficient?

  6. Why do all machines need energy input?

  7. You are on a swing. Occasionally you need a push to keep going. Why?

  8. In an experiment you roll a ball down a ramp and measure Potential and Kinetic Energy. You find that the values for kinetic energy are always just a little less than the values for potential energy. Did you do the experiment wrong? Why or why not?