Banner

Ask a Physicist


  1. What is energy?
  2. What is mass?
  3. What is matter?
  4. Where did total gravitational energy of the universe come from? - by Alan Guth (from  Appendix A of his book The Inflationary Universe)
  5. Does E = mc2 mean that mass can be conveted into energy?
  6. Does E = mc2 mean that matter can be conveted into energy?
  7. Is Newton's 1st Law written as F = ma or F = dp/dt?
  8. Is a photon "energy"?
  9. Are mass and energy the same thing?
  10. Is mass "congealed" or "frozen" energy?

































Extended Page Length