Where Does Energy Come From? (Extended Lesson)

Students use logic to work through thought experiments involving relative reference frames and inertia. Through these, students are introduced to the concepts of special relativity -- which leads to surprising conclusions about the nature of time and space -- and the fundamental connection between mass and energy.


  • Lesson plans: Where Does Energy Come From? (Extended Lesson Plan)
  • Videos: Alice & Bob: Where Does Energy Come From? (approx. 1 min)
  • Activities: Scientific Models: Time; Scientific Revolution: Special Relativity (worksheets, review questions, and solutions)
  • Supplementary Materials: How to Build a Black Box Model

(Note: all lesson plans and worksheets provided as PDFs and modifiable MS Word documents)

Intended Audience: Senior High (Gr 11-12)
Lesson Topics: Energy, Relativity
Price: Free