Physics Crossword Puzzle

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Across
  1. 6. equal forces acting upon an object
  2. 7. the rate of change of velocity
  3. 8. how fast an object moves
Down
  1. 1. resistance against a surface
  2. 2. unequal forces acting upon an object
  3. 3. speed of an object in a given direction
  4. 4. the push or pull of an object
  5. 5. sum of all forces acting upon an object