physics - is a branch of sciencethat involves the study of physical world : energy , matter ,and how they are related , scientific methods - follow similar patterns , a hypothesis - is a possible explanation for a problem using what you know and have observed , models - is representation of an idea , event , structure , or object that helps better understand it , a scientific theory  - is an explanation of things or events based on knowledge gained from many observations investigation , a scientific law - is a statement about what happens in nature and seems to be true all the time , a significant figures - the valid digits in a measurement, a measurement - is a comparison between an unknow quantity and a standard, precision - the degree of exactness of a measurement , Accuracy - describes how well the results of a measured agree with the real value ;that is , the accepted value as measured by competent experimenters  , independent variable  - the factor that is manipulated during an investigation , dependent variable - the factor that depends on the independent variable , linear relationship - the dependent variable varies linearly with the indepen -dent variable, A quadratic relationship - exists when one variable depends on the square of another, inverse relationship - is a hyperbolic relationship in which one variable depends on the inverse of the other variable , motion diagram - A series of images showing the position of a moving object at equal time intervals , particle model - you replace the object or object with single point , The origin - is the point at which all variables in a coordinate system have the value zero , vector - A quantity that has both magnitude and direction , scalar - A quantity that is just a number without any direction , such as distance ,time ,or temperature , Time interval - the difference between tow time , displacement - A change in position , Average velocity - is the ratio of an objects change in position to the time interval during which the change occurred , average speed - the slopes absolute is the objects, instantaneous velocity - the speed and the direction of an object at a particular instant , acceleration - the rate at which an objects velocity changes , average acceleration - of an object is its change in velocity during some measurable time interval divided by that time interval , instantaneous acceleration - the change in an objects velocity at an instant of time , free fall - is the motion of an object when gravity is the only significant force acting on it , free fall acceleration - the acceleration of an object due only to effect of gravity is known,

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