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Across 1. the greatest velocity a falling object can acheive 3. the rate at which work is done 6. forces that produce a nonzero net force which changes an objects motion 7. the amount of matter in an object 8. an object is thrown 12. the fluid friction experienced by objects falling through the air 14. any change in position or location of an object 15. the rate at which velocity changes 16. speed in a given direction

Down 2. in the absence of an outside force, the total momentum of the objects that interact does not change 4. equal forces acting on an object in opposite directions 5. forces exerted on an object which forces it to move 9. the force of gravity on an object at the surface of a planet 10. the tendency of an object to resist a change in motion 11. the force that pulls objects toward each other 13. the product of an object's mass and velocity