Matthew's crossword

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Across
  1. 5. a person who commands a group
  2. 6. small blue humanoid creatures
  3. 8. the force of gravity on an object
  4. 10. somebody from siberia
  5. 11. the standard measurement of force
Down
  1. 1. a push or a pull
  2. 2. a red muppet character
  3. 3. the amount of matter in an object
  4. 4. a group defined by unusual beliefs
  5. 7. someone who brings gifts on Christmas
  6. 9. a force that resists an objects motion