Electromagnetic Forces INV. What is Force?

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Across
  1. 4. an instrument used to measure force
  2. 6. energy of motion
  3. 7. a force acting between surfaces in contact, acts to resist motion
  4. 8. the sum of all forces acting on a mass
Down
  1. 1. a push or pull
  2. 2. the ability to apply force over a distance
  3. 3. to act on and be acted upon by one or more objects
  4. 5. the standard unit of measuring force in the metric system