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Across 5. a wind pushing from behind 8. when there is an action, there is always an equal or opposite 12. law of action and reaction 14. law of force and acceleration 17. the resistive force that opposes the motion or attempted motion of an object past another with which it is in contact, or through a fluid 19. how steep something is 20. the SI unit force; abbreviated N 21. a motion occured with required forces 23. when an object falls downward through the air, the force of friction ( ) acts upward 24. also known as the normal force

Down 1. the gravitational force exerted on an object by the nearest most-massive body (the earth) 2. a wind pushing from ahead 3. the tendency of things to resist changes in motion 4. the speed of an object and specification of its direction of motion 6. the way something is going is called its 7. the change of velocity divided by time interval 9. law of inertia 10. the two values change in opposite ways 11. when one of more objects interact 13. the combination of forces that act on an object 15. 3 F = 0 16. a motion occured without force 18. the fundamental SI unit of mass 19. distance traveled divided by time 22. the quantity of matter in an object