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### 15 Cards in this Set

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 dynamic the branch of physics that is concerned with the motion of an object and the relationship of this motion to such physical concepts as force and mass Define: kinematics part of dynamics that describes motion without regard to the causes Define: frame of reference choice of coordinate axes that defines your starting point for measuring any quantity Define: displacement the difference between the final and initial position Define: vector quantity a physical quantity that must be characterized by both a magnitude and a direction Define: scalar quantity a physical quantity that has magnitude, but not direction Define: average velocity the displacement divided by the time interval during which the displacement occurred Define: speed the total distance divided by the time of the total distance Define: instataneous velocity the velocity of an object at one moment in time Define: instataneous speed scalar quantity--defined as the magnitude of instataneous velocity Define: average acceleration defined as the change in velocity divided by the time interval during which that change occurred What happens when the object's velocity and acceleration are in the same direction the speed of the object increases with time What happens when the object's velocity and acceleration are in opposite directions the speed of the object decreases with time Define: instataneous acceleration at any time is the slope of the velocity-time curve at that instant What does this mean on a graph? v^2=vi^2=2ax The area under any curve on a velocity-time graph is equal to the object's displacement