control surface vs pedal

control surface

noun
  • A moveable surface attached to a machine such as an aircraft or submarine that can be used to control the machine's motion in roll, pitch or yaw. 

pedal

noun
  • A lever operated by one's foot that is used to control or power a machine or mechanism, such as a bicycle or piano 

  • The ranks of pipes played from the pedal-board of an organ. 

  • an orthopedic structure or a footlike part. 

  • An effects unit, especially one designed to be activated by being stepped on. 

  • A stirrup. 

verb
  • To operate a pedal attached to a wheel in a continuous circular motion. 

  • To operate a bicycle. 

adj
  • Of or relating to the foot. 

How often have the words control surface and pedal occurred in a corpus of books? (source: Google Ngram Viewer )