b

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Across
  1. 4. net force is a nonzero value
  2. 6. combination of all forces acting on an object
  3. 9. speed with direction
  4. 10. force where one object touches or bumps into another
  5. 13. net force is equal to zero Newtons
Down
  1. 1. force between two objects not touching
  2. 2. force with negative and positive charges
  3. 3. force acting between materials with two poles
  4. 5. attraction between two masses at a distance
  5. 7. measure of force of gravity acting upon a mass
  6. 8. SI unit for force
  7. 11. s=d/t
  8. 12. amount of matter in a material