CONTACT FORCES

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Across
  1. 2. a set of things working together as parts of a mechanism or an interconnecting network.
  2. 3. the strength and vitality required for sustained physical or mental activity.
  3. 4. physical harm caused to something in such a way as to impair its value, usefulness, or normal function.
  4. 6. strength or energy as an attribute of physical action or movement.
  5. 8. reciprocal action or influence.
  6. 9. relating to or resulting from motion.
Down
  1. 1. having or showing the capacity to become or develop into something in the future.
  2. 2. a self-contained system within a larger system.
  3. 5. an instance of one moving object or person striking violently against another.
  4. 7. the state or condition of physical touching.