1. Warm-Up 9/18/13
Consider the path taken by a person crossing the river. What color arrows describe the distance of his trip? The displacement?

2. Distance and Displacment
Section 11.1
9/18/13

3. Introduction to Motion
“How fast” depends on your frame of reference
We can measure motion relative to some given location (called relative motion)

4. Distance Distance= the length of a path between two points
Can be measured in m, km, cm…

5. Total Distance

6. Then What is Displacement?

7. Displacement
Displacement= the direction and distance from the starting point to the ending point along a straight line
Ex) 5 blocks North from the bus stop

8. Combining Displacements
Displacements can be added, though we must pay attention to distance and direction
Ex) Walking forward 10 steps, then backward 3 means a total displacement of 7 steps

9. Vector vs. Scalar
Vectors provide information about direction and distance
Ex) 3 meters East
Scalars only provide information about distance
Ex) 3 meters