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Across 1. The amount of time for a complete circle or cycle 2. A force that opposes motion when two surfaces slide past each other 4. The product of force and distance when they act in the same direction 8. A type of collision where momentum is conserved, but KE is not. 9. A change in momentum 11. The type of force that is directed perpendicular to a surface 12. The rate of change of velocity with time 14. The rate at which work is done; the rate at which energy is used. 16. The size of a given quantity - how much? how fast? how far? etc. 20. A push or pull on an object due to the interaction of two objects. 21. A type of collision where both KE and momentum are conserved 22. A term used with "energy" or "friction" that implies motion 24. A quantity with magnitude & direction 25. A term used with "friction" that implies a lack of motion

Down 1. A term used with "energy" that implies stored energy. 3. A term often used with "acceleration" that literally means "center-seeking" 5. The units for mass when using an equation 6. The change in position of an object (from start to finish) 7. The number of circles or cycles per unit of time 10. The ability to do work 13. Inertia in motion 15. The slope of a position-time graph, can be + or - 17. How fast an object is traveling 18. The tendency for an object to resist changes in velocity; directly related to its mass. 19. A force that exists between any two masses separated by a distance 23. The units used to measure force