10th grade physics

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Across
  1. 2. A special name for a liquid or gas
  2. 4. Sum of clockwise moments are equal to the sum of anticlockwise moments
  3. 5. The velocity of falling parachutist, when his weight is equal to air resistance
  4. 6. What is the force that opposes the motion of one surface sliding past another called?
  5. 8. Acceleration and velocity are _______ quantities
  6. 13. A pair of forces that are equal and opposite to each other
  7. 14. The synonym of the word "constant"
  8. 18. What is the property of a body to resist a change in its state of motion called?
  9. 20. What is the measure of the force of gravity on an object called?
  10. 22. What is the rate of change of displacement with respect to time called?
Down
  1. 1. What is the SI unit of energy?
  2. 3. The resistant force of air
  3. 7. A force that objects experience when they move through a fluid
  4. 9. Sum of two or more forces acting on an object
  5. 10. Speed, mass and time are ______ quantities
  6. 11. What is the SI unit of mass?
  7. 12. A change in position (vector quantity)
  8. 15. What is the force of attraction between two objects with mass called?
  9. 16. What is the SI unit of force?
  10. 17. What type of energy does a moving car possess?
  11. 19. What is the rate of change of velocity with respect to time called?
  12. 21. What is the phenomenon where a sound wave is reflected back to its source?