Motion, Distance, Direction

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Across
  1. 1. Tool used to determine cardinal directions
  2. 3. Part of "frame of reference"
  3. 6. Its wings move so fast they're a blur
  4. 9. Push or pull acting on an object
  5. 10. Symbol used to represent a vector
  6. 12. Slow-moving creature, often used to describe gradual motion
  7. 16. Tool used to measure distance with a scale
  8. 17. Length of the route between two points
  9. 18. Example of a cardinal direction
  10. 19. Force that pulls objects toward the ground
  11. 20. Speed of an object in a specific direction
Down
  1. 2. Example used to describe overcoming gravity
  2. 4. Planet that exerts a gravitational pull
  3. 5. Component of motion described as up, down, left, or right
  4. 7. SI unit for measuring distance
  5. 8. Location of an object
  6. 11. A measurement with only size, not direction
  7. 13. Change in an object's position
  8. 14. Measurement that has both size and direction
  9. 15. A stationary point used to detect motion