I found a great interactive children’s game to help explain the difference between the two.
Take a few minutes and check out the Flight Adventures Game for students found at the Children’s Museum of Indianapolis. The game allows children to change the elevons and rudder on the FPG-9 to direct it to the target. The elevons and rudder control the pitch, yawl and roll.
This website was recommended in the AHG Handbook for help with the Living and Working in Space Merit Badge.
NOTE: The requirements have been simplified here. Please be sure to read the full text in the Girl Handbook to make sure you fully understand the requirements.