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# 12C Motion Terms

Define kinematics Study of motion. Describes how objects move (but not why they move)
What is a scalar quantity? Quantity that has a number and unit. E.g., 10 m
What is a vector? Quantity that has a number,a unit and a direction. E.g., 24 m/s [W]
Define position Distance and direction of an object from a reference position. Vector.
Define displacement Change in position of an object. Vector quantity.
Formula for displacement? Final position minus initial position.
Define speed Ratio of distance travelled to the total time time of travel. Scalar.
Formula for speed Distance travelled divided by the time.
Define velocity Ratio of displacement to the time interval for displacement. Vector.
Formula for velocity Displacement divided by the time.
Define accelerated motion Motion with changing velocity (changing speed, changing direction, or both changing speed & direction).
Define constant acceleration Straight line motion in which velocity changes by same amount each second
Formula for acceleration Change in velocity (final velocity minus initial velocity) divided by time. Vector.
State value of acceleration due to gravity 9.8 m/s^2 [down]
What does it mean for an object to be in free fall? When air resistance on a falling object is ignored. When objects fall with acceleration due to gravity.
Created by: mskimteacher