##### Across

**3.**SI base unit for mass.**4.**A branch of science that involves the study of matter, energy, and how they are related.**5.**In a linear relationship, there is a ________ rate of change between the two variables.**12.**The relationship when the two variables varies linearly with each other or the two variables are directly proportional.**16.**The graph of an inverse relationship is called __________ .**17.**A quantity that has both magnitude and direction.**18.**A comparison between an unknown quantity and a standard.**19.**The _________ of the position vector is proportional to the distance of the object from the origin.**20.**This relationship exists when one variable depends on the square of another.**21.**The rate of change in position.

##### Down

**1.**Describes how well the results of a measurement agree with the real value.**2.**The change in position from initial to final position.**6.**All nonzero digits in a measurement are __________.**7.**Any factor that might affect the behavior of an experimental setup is called a(n) ________.**8.**A possible explanation for a problem using what you know and have observed.**9.**A quantity that has only magnitude without any direction.**10.**The rate of change in velocity.**11.**This is the variable that is manipulated during an investigation.**13.**This relationship exists when one variable depends on the inverse of the other.**14.**This is the ratio of the vertical change to the horizontal change between two data points in a linear graph.**15.**These are used when changing SI base units by powers of 10.