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Across 2. A collision when two objects collide and bounce apart. 3. When two balls hit in a game of pool, the momentum is ___________ between the two balls. 5. The SI unit for ________ is the kilogram*meter/second. 7. Circus safety nets, bungee jumping cords, and car airbags are all examples of ways to extend the ____ __ ______. (3 Words) 10. To ________ the force of impact, extend the time of impact. 12. To increase momentum, apply the ________ force possible for as long as possible. 13. _______ is indicated with the letter "J". 15. When an external force acts on an object. 17. The SI unit for _______ is the newton*second. 18. In a system where there are no outside forces, momentum before the collision is _______ to momentum after the collision. 19. When rollerskates are moving fast and a truck is moving slow, they have the same ________.

Down 1. Change in velocity equals change in ____________. 4. Mass multiplied by velocity equals ________. 6. When an object bounces, impulses are _______. 8. Pulling a sling shot is and example of __________ momentum. 9. A collision when two objects stick together. 11. The law of conservation of momentum states that the total momentum in a system remains the same if no ________ forces act on the system. 13. The product of the force exerted on an object and the time interval during which it acts is called _______. 14. If a ping pong ball and a bowling ball are rolling down a hill with the same velocity, the bowling ball has more ________. 16. Force multiplied by time equals _______.