Momentum Fun Time

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Across
  1. 2. a rubber ball bounces off the ground
  2. 4. particles of the system move apart after a brief intense interaction
  3. 6. Anything that is not in the system that is discussed
  4. 7. short-duration interaction between two objects
  5. 9. Rotational analog of linear momentum
  6. 12. the product of the object’s mass and velocity
  7. 13. impact force is large enough for net force ≈ impact force
  8. 14. when no net external force is acting to change the momentum in a system
Down
  1. 1. forces that come from agents outside a system
  2. 3. Collection of objects that can be identified
  3. 5. the vector sum of the momentum of each of the objects
  4. 8. forces that come from agents within a system
  5. 10. a large force that is excreted during a short interval of time
  6. 11. a ball of clay sticks to the ground