Work Crossword Puzzle

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Across
  1. 4. Increase in speed: unbalanced force
  2. 8. Activity involving mental or physical effort
  3. 9. The unit that america uses to measure work
Down
  1. 1. An amount of space between two things
  2. 2. Physical substance on earth
  3. 3. The unit to measure work and energy
  4. 5. Natural power that all living things have
  5. 6. An objects weight
  6. 7. A push or a pull
  7. 8. The formula to find work