Motion

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Across
  1. 3. A body's relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing
  2. 5. Reduction in speed or rate
  3. 7. Strength or energy as an attribute of physical action or movement
  4. 8. Resistance to change in some other physical property.
  5. 9. The degree of steepness of a graph at any point
  6. 11. The rate at which someone or something moves or operates or is able to move or operate
Down
  1. 1. Increase in speed or rate
  2. 2. The length of the space between two points
  3. 3. Activity involving mental or physical effort done in order to achieve a purpose or result
  4. 4. The speed of something in a given direction
  5. 6. A large amount of material
  6. 10. The indefinite continued progress of existence and events in the past, present, and future regarded as a whole