Physic

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Across
  1. 4. opposite or contrary in position, direction, order or effect
  2. 6. push suddenly or violent in a specified direction
  3. 7. the ability not to be affected by something, especially adversely
  4. 8. corresponding in size or amount of something
  5. 9. represent by means of symbols
Down
  1. 1. to be a sign of...
  2. 2. to make a physical or mental effort
  3. 3. a large rock, typically one that has been worn smooth by erosion
  4. 5. unimportant as to be not worth considering or insignificant
  5. 8. small stone made smooth and round by the action of water or sand