How roller coasters work

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Across
  1. 1. place where people sit
  2. 2. we need a... to swing us
  3. 3. supply (a device) with mechanical or electrical energy
  4. 5. Technique Resistance to movement that occurs between two surfaces in contact.
  5. 7. the sport or activity of ascending mountains or cliffs.
  6. 8. rapidity in moving
  7. 9. he force that attracts a body toward the center of the earth
Down
  1. 1. the process of changing one form of energy into another
  2. 4. is the feeling of weightlessness, of falling into a void
  3. 6. The journey generally forms a...