Benjamin, Matrena, Piercarlo

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Across
  1. 4. able to be magnetised or be attracted to a magnet
  2. 8. force the vector sum of numerous forces, whose direction is opposite to the motion of a body
  3. 9. the amount of matter in a body
  4. 12. increase in velocity over time
  5. 13. the resistance that one surface or object encounters when moving over another
  6. 15. A speed in a direction
  7. 16. the quantity of motion of a moving body, measured as a product of its mass and velocity.
  8. 17. apply a force to (something) which tends to stretch it.
  9. 19. when the speed has the same value throughout its journey
Down
  1. 1. an adjective that describes the force which attracts objects between each other
  2. 2. a body's relative mass
  3. 3. A fixed pin or short axis
  4. 5. the length of the space between two points
  5. 6. a decrease in rate of change of velocity
  6. 7. quantity, amount or distance of something
  7. 10. a quantity that has both magnitude and direction
  8. 11. not much
  9. 14. the condition in which people or objects appear to be weightless
  10. 18. increase in acceleration over time