HAPPY HOLIDAYS from Mr. McCarthy!

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Across
  1. 4. The reason snowflakes fall more gently than hail
  2. 5. Antiparallel to displacement in a holiday bonspiel
  3. 7. December 21st at 10:03 AM
  4. 9. Attended on xmas eve, but photons don't have it
  5. 10. Inversely proportional to how many sufganiyot one consumes
  6. 13. Measures current in Boxing Day sale gadgets
  7. 16. The force that attracts all masses, except reindeer apparently
  8. 17. Her two Nobel Prizes would make great ornaments
  9. 22. Annihilates matter
  10. 23. Used to illustrate all the forces on a player at the World Juniors
  11. 24. As direction-less as that story your weird uncle will tell at the dinner table
  12. 26. Part of the EM spectrum that warms up holiday leftovers
  13. 28. Path-independent, unlike first-tracks on the hill
  14. 29. Conserved locally for a few seconds while the dreidel spins
  15. 30. Our lord and saviour, born December 25
  16. 31. What you get when you combine the 4 lightest elements in HOHOHOHO
  17. 32. The distance and direction between tracks in the snow
  18. 33. The quantum number that decides whether electrons behave "naughty or nice"
  19. 34. The force inside a Christmas Cracker
Down
  1. 1. His presents were both exciting and disappointing, until unwrapped
  2. 2. Becomes zero in the y-direction right as NYE fireworks reach maximum height
  3. 3. Decays in fewer than 8 nights
  4. 6. Makes stopping on the ski hill tricky
  5. 8. Built up while tobogganing as kinetic energy increases
  6. 11. A typical snow-covered roof has two
  7. 12. The state of every snowball, after the throw
  8. 14. Studied at the IceCube Observatory in Antarctica
  9. 15. A present for all three generations, built with 16 parts plus Higgs!
  10. 18. Can be used to find the north pole if we know current and force
  11. 19. Released when Pt-199 transforms into Hanukkah gelt
  12. 20. Emmy Noether's Theorem predicts results would be the same in each of Scrooge's dreams
  13. 21. Key figure in the mechanization of Santa's Workshop
  14. 25. Measures static charge in mittens fresh out of the dryer
  15. 26. Surprisingly, these actually point TOWARDS Santa's workshop
  16. 27. Unit of power specified on holiday lights