## Direction and Distance

**Distance**is the total length of the path travelled by an object in motion.

**Direction**is the line an object moves along from a particular starting point, expressed in compass degrees (north, east, south and west) or up, down, left, right and even forwards or backwards.

A

**scalar**is a quantity that has magnitude (size) only. (ex: distance of 50m).

A

**vector**is a quantity that has magnitude (size) and direction.

(ex: 25km [North])

## Position and Displacement

**Position (d)**is the distance and direction of an object from a particular reference point; it is a vector quantity.

**Displacement (∆d)**is the change in the object's position. It is a vector quantity. Calculated by subtracting the initial position vector from the final position vector:

If an object changes its position multiple times, the total displacement (∆dT) must be calculated by adding the displacements:

## Vectors- Vector Scale Diagrams

**Vector Scale Diagrams**are diagrams drawn using a specific scale and are associated with displacement. Vectors are represented by a straight line between two points with a particular direction. Vectors are added from tip to tail.

## Position vs. Time Graphs

**Position vs. Time graphs**are graphs that describe the motion of an object, the y axis (vertical axis) being the position, and the x axis

(horizontal axis) the time.

The slope of a position vs. time graph (rise over run) is the velocity of the object.

## Practice

**Worksheets**

1. http://home.comcast.net/~schnids78/Holt%20Physics/Chapter%203/PB_3A.pdf (worksheet)

**1.**

Simulations/Gizmos

Simulations/Gizmos

__http://k12resources.nelson.com/science/9780176390785/student/attachments/ott/ani/school_flash.html?file=distance_time_graph__(position time graphs)