Cross Puzzle 2

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Across
  1. 2. a single force whose external effects on a rigid body are the same as the effects of several actual forces acting on the body
  2. 5. the change in position of an object
  3. 12. Inertia is the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction.
  4. 13. a physical quantity that has both magnitude and direction
  5. 14. a system including x axes and y axes
  6. 15. the total displacement divided by the time interval during which the displacement occurred
  7. 16. the projections of a vector along the axes
  8. 19. the longest side of a right triangle
  9. 20. 1cm=20 000m is a ____ can be used on a map.
  10. 21. represented by Fg
Down
  1. 1. the resistance encountered when one body is moved in contact with another
  2. 3. which shows only the forces acting on the object of interest
  3. 4. a motion which is in a parabola curve
  4. 6. the state in which the net force on an object is zero
  5. 7. F=ma
  6. 8. a physical quantity that has magnitude but no direction
  7. 9. An object at rest remains at rest, and an object in motion continues in motion with constant velocity (that is, constant speed in a straight line) unless the object experiences a net external force
  8. 10. a force perpendicular to the contact surface
  9. 11. a vector that represents the sum of two or more vectors
  10. 17. a measure of inertia
  11. 18. an action exerted on an object which may change the object’s state of rest or motion