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## Scalars and Vectors

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**Scalars are quantities which are fully described by a size**alone. Eg. Temperature, Distance, Time, Speed, Mass, Length**Vectors are quantities which are fully described by both a**size and a direction. Eg. Velocity, Acceleration, Force, Thrust, Drag To properly describe a vector, you must include two items: Size or quantity and Direction. For example, 25m/s north.**Direction can also be given using a + and -.**For example, +ve can be defined as west and –ve as east.**Graphically Representing Vectors**Vectors are drawn using arrows. Arrows have size (length) The greater the size of the vector, the longer the arrow. Arrows have and show direction**If this vector below represents a velocity of 13 m/s, east,**select the vector that represents 6.5 m/s, west. 13 m/s, E 6.5 m/s, W**Motion Concepts**Motion means a continuous change in the position of a body relative to a reference point. Average Speedis defined as the total distance an object moved divided by the total time needed to make the move. Average Speed is a scalar quantity.**vs represents the average speed**d is the distance Dt is the interval of time needed for the move**(the Greek lower case letter “delta”) is very**important. It means a "change in". Dt is the difference between the time at the end of the motion tf (final time) and the time at the beginning of the motion ti (initial time).