Fact 1: Producing thrust causes something to move.

Fact 2: Airplanes create thrust using propellers, jet engines , or rockets .

Given the two facts above, answer the question "Propellers are on some airplanes primarily to give" with the following options: 
- stability
 - protection from bird strikes
 - speed
 - motion
 - engine cooling
 - energy
 - noise cancellation
 - power


 

    motion     