NTI day 9 first one

123456789
Across
  1. 2. a tendency to do nothing or to remain unchanged
  2. 5. the formula for force
  3. 7. the vector sum of forces acting on a particle or body
  4. 9. increase in the rate or speed of something
Down
  1. 1. change in motion of the object where force is applied
  2. 3. classical mechanics, all forces occur in pairs
  3. 4. two forces acting in opposite directions
  4. 6. one surface or object encounters when moving over another
  5. 8. 3 laws