pendulum vs pressure

pendulum

noun
  • Used to refer to the tendency of a situation to oscillate (between two extremes). 

  • A watch's guard-ring by which it is attached to a chain. 

  • A lamp, etc. suspended from a ceiling. 

  • A body suspended from a fixed support so that it swings freely back and forth under the influence of gravity, commonly used to regulate various devices such as clocks. 

pressure

noun
  • A contrasting force or impulse of any kind 

  • A pressing; a force applied to a surface. 

  • Distress. 

  • The amount of force that is applied over a given area divided by the size of this area; force per unit area. 

  • Urgency 

verb
  • To encourage or heavily exert force or influence. 

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