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Across 3. a coordinate system in which the position of the object(s) is measured 7. speed at a given point in time 8. states that when one object exerts a force on a second object, the second object exerts a force the the first object that is equal in strength and in the opposite direction; Newton's.......... 9. a push or a pull; this quantity is equal to an object's mass times its acceleration 10. acceleration (in m/s/s) = net force (in newtons)/ mass (in kg); Newton's.......... 12. a German meteorologist who, in the early 1900s, developed the theory of Continental Drift (all Earth’s continents/ crust/ lithosphere were once part of a single landmass called Pangea and that they slowly move on top of the mantle) 14. forces on a object that combine to give a zero net force and do not change the motion of the object 16. the total displacement divided by the time 17. the distance and direction of an objects change in position from the starting point 19. this is equal to the change in velocity divided by the length of the time interval over which the change in velocity occurred; units are meters / second / second ( m/s/s) 20. occurs when an object changes its position relative to a point of reference 21. British scientist (b. 1642 - d. 1727) who came up with rules that describe the effects of forces on the motion of objects 22. this quantity is equal to an object's rate of motion multiplied by its time in motion

Down 1. quantity that includes the speed of an object and the direction of its motion 2. 9.8 m/s/s 4. states that an object in motion/ moving at a constant velocity tends to stay in motion unless an unbalanced force net force acts on it; additionally, if an object is at rest it tends to stay at rest unless an unbalanced net force acts on it; Newton's.......... 5. when two unequal forces act on an object in opposite directions a net force occurs in the direction of the greater force;..........also occur when two forces act (and are added) together 6. the sum of the forces acting on an object 11. the total distance traveled divided by the total time of travel 13. any change over time; if you think of distance as change in position, then speed is the..........at which distance is traveled or the..........of change in position 15. a quantity measured in meters per second; this value is equal to the distance traveled divided by the total time of travel 18. the tendency of an object to resist any change in its motion