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?