1. 7. Position & Motion

2. Describing Position
Reference point: the starting point you choose to describe the location or position of an object
Position: distance and direction from the reference point
Reference direction: the positive (+) direction
The opposite direction is the negative (-) direction

3. Describing changes in position
Motion is the process of changing position
Distance is the length of the path traveled
Displacement is the difference between the initial and the final position of an object

4. Practice Problems: Draw a diagram for each situation
Practice Problems: Draw a diagram for each situation. Calculate the distance and displacement in each.
Amy runs 2 km south, then turns around and runs 3 km north.
Jermaine runs exactly 2 laps around a 400 meter track.
Ray runs 30 meters north, 30 meters west, and then 30 meters south.
James spins around 5 times without moving any direction.
Desmond walks 2 km north from his house to the park, then returns home.
Sandy ran 8 blocks north, and then 2 blocks south back toward her starting point.
Anslee swam 3 complete laps in a 50 meter pool. (1 lap is one length of the pool)
Alex walks east 3km, stops for a break, and then runs the same direction for 4 km before he stops.
Taylor rides her bike 20 km north, turns around, and then rides her bike 15 km back toward her starting point.