Balanced and Unbalanced Forces

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Across
  1. 2. something that does not vary in experimental circumstances
  2. 3. a pull that exerts a downward force
  3. 4. position changes with respect to its surroundings with time
  4. 7. the straight path an object can move along
  5. 10. opposing forces or actions are balanced so that one is not stronger or greater than the other
  6. 12. an English mathematician, physicist, astronomer, theologian, and author widely recognized as one of the greatest mathematicians and physicists of all time and among the most influential scientists
  7. 13. press against something with steady force
  8. 14. not changing position with respect to its surroundings with time
  9. 15. exert force on (someone or something) so as to cause movement toward oneself
Down
  1. 1. two forces that are not equal in size and act in opposite directions
  2. 5. push or pull that causes an object to stop, move, or change direction
  3. 6. a place where someone or something is located or has been put
  4. 8. something that becomes different
  5. 9. the rate or change of position in a period of time
  6. 11. two forces equal in size and acting in opposite directions on an object