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Across 3. the number of times a simple machine will multiply its force 4. a combination of two or more simple machines 6. friction that acts on objects that are not moving 8. a place or object used for comparison to determine if an object is in motion 12. an increase in velocity 13. the force of gravity on an object at the surface of a planet 14. the standard unit used to measure work 15. the amount of matter in an object 16. the rate at which work is done 18. forces that are not being balanced by a force of equal strength and in the opposite direction 19. the resistance of a stationary object of being moved and the resistance of a moving object to changing direction and speed

Down 1. the greatest velocity a falling object can achieve 2. the rule that in the absence of outside forces the total momentum of objects that interact do not change 5. the resistance that opposes the falling motion of objects 7. the application of energy that causes something to move 9. the product of an object's mass and velocity 10. an object that is thrown 11. the speed that an object travels in a given distance 15. any change in the position or location of an object 17. force of attraction that acts between all objects