Four Pushes and Pulls: teacher key

Airplanes, grade 2 edition, written for 2nd grade. What keeps a plane flying? Four forces push and pull it. Learn what wings, engines, the tail and flaps do, and how two brothers made the first powered flight.

Read the book. Print this page for the key.

Questions and answers

1. Which force holds a plane up in the air?
   • Drag
   • Lift (answer)
   • Weight
2. What is weight?
   • The pull of gravity (answer)
   • The push of an engine
   • The air pushing back
3. What do ailerons do?
   • They make the plane roll (answer)
   • They turn on the lights
   • They make a push forward
4. What does the rudder turn?
   • The wheels
   • The wings
   • The plane's nose (answer)
5. What do wings make when a plane is not moving through the air?
   • Lots of lift
   • No lift (answer)
   • Thrust
6. How many flights did the Wright brothers make on December 17, 1903?
   • Two
   • Four (answer)
   • Ten

Words

• thrust: a push forward
• drag: air pushing back
• ailerons: wing parts
• rudder: tail turning part
• flaps: hinged wing parts