Fun with physics

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Across
  1. 4. Physics also is the study of
  2. 8. without this, there is no velocity change
  3. 9. SI unit of energy
  4. 10. SI unit of mass
  5. 12. amount of substance
  6. 14. any physical material is
  7. 16. it is effect to change the direction of motion, shape and velocity of an object
  8. 17. The first Newton's law
  9. 18. Name any 1 of 7 bacis quantities
Down
  1. 1. Who are the people that study physics?
  2. 2. What are the studies of things move?
  3. 3. SI unit of force
  4. 5. it has a magnitude, unit and direction
  5. 6. Isaac Newton studied
  6. 7. enclosed area in the space
  7. 11. SI unit of length
  8. 13. SI unit of time
  9. 15. physics is the study of