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Across 1. The rate of speed of action or occurrence 4. the change in velocity divided by the time intervalin which the change occured 5. the cause of an acceleration, or change in an objects velocity 6. the tendency of an object to remain at rest or in motion with a constant velocity 7. the unbalanced force acting on an object equals the objects mass times its acceleration 8. the motion of a body when only the force of gravity is acting on it 9. In the meter-kilogram-second system, the unit of force required to accelerate a mass of one kilogram one meter per second per second, equal to 100,000 dynes. 11. for every action force there is an equal and opposite reaction force

Down 2. the maximum velocity reached by a falling object that occurs when the resistance of the medium is equal to the force due to gravity 3. A measure of the heaviness of an object 5. an object at rest remains at rest and an object in motion maintains its velocity unless it experiences an unbalanced force 10. the measure of the quantity of matter in an object