Chapter 2

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Across
  1. 8. the increase of length of a spring when a force is exerted on it
  2. 9. the surface of an object or person as seen from in front
  3. 10. a force that resists a motion and acts against that motion
  4. 11. way of representing the size, direction and point of application of a force as an arrow
Down
  1. 1. resistance that arises because a moving object has to push the air in front of it aside
  2. 2. an instrument with a helical spring that is used to measure forces
  3. 3. the force with which the earth attracts you and all the objects around you
  4. 4. resistance that arises when two surfaces move against one and other, such as a ski gliding over snow
  5. 5. the length of a spring that has not been extended
  6. 6. the sum of the forces acting on an object
  7. 7. a force that arises when the muscles in a body contract