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Across 7. vector that represents the sum of 2 vectors 8. acceleration of an object due only to the effect of gravity 12. comparison between an unknown quantity and a standard 15. gives the location of the zero point of the variable you are studying and the direction in which values of the variables increases 17. variable that is measured by the scientist 18. change in position with direction 20. valid digits in a measurement with one digit that is estimated 22. branch of science that involves the study of the physical world 23. quantity without direction 25. distance and direction from the origin to the object 26. set of steps, a pattern of investigative procedures 27. degree of exactness of a measurement 28. statement about what happens in nature and seems to be true all the time

Down 1. process based on inquiry that helps develop explanations about events in nature 2. method of treating units as algebraic quantities that can be cancelled 3. quantity that has both magnitude and direction 4. explanation of things or events based on knowledge gained from observations and investigations 5. `entire length of an object's path 6. change in position 9. rate at which an object's velocity changes 10. variable that is changed by the scientist 11. created by combining base units 13. multiplier equal to 1 14. size 16. describes how well the results of a measurement agree with accepted values 19. tools for modeling observations and for making predictions 21. any factor that might affect the behavior of an experimental set up 24. representation of an idea, event, or structure that helps people better understand it