Forces and Space

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Across
  1. 1. On Earth, every 1kg of mass is pulled towards earth by a force of ..... n
  2. 5. Our sun is a ....
  3. 6. Mass is the amount of ...... an object has
  4. 7. How many planets does the solar system have?
  5. 10. What is mass measured in?
  6. 12. The force created when two objects rub against each other
  7. 13. This planet has the strongest gravity in our solar system
Down
  1. 2. What is weight measured in?
  2. 3. Complex life needs liquid ...... to survive
  3. 4. What is air friction also known as?
  4. 8. Instrument used to look at other stars and planets
  5. 9. Two forces of equal size going in opposite directions are...?
  6. 11. What force pulls objects down towards Earth?