1. Distance and Displacement
11.1

2. Frame of Reference Objects are not moving with respect to one another
Needed to accurately describe motion
What is your frame of reference?
You are on the earth…the earth is spinning on its axis and revolving around the sun, therefore you are moving even when you are standing still

3. Relative Motion Movement in relation to a frame of reference
People at the train station see a train speeding by. But people on the train aren’t moving at all, relative to each other

4. Distance
The length between 2 points
Units are meter and kilometer

5. Displacement
The length of a straight line from the starting point to the ending point
It also includes direction
If you travel in a circle, your displacement is zero.

6. Combining Displacements
Displacement is an example of a vector- a quantity that has magnitude and direction
Magnitude can be size, length or amount
Arrows on a graph represent vectors
You can add displacements using vector addition
Pg 330 Figure 3

7. When two displacements- represented by vectors- have the same direction, you can add their magnitudes- Figure 3A
When they are in opposite directions, you subtract their magnitudes- Figure 3B

8. Resultant Vectors
If the displacement- starting point to ending point- is not along a straight path, you use vector addition to find the resultant vector
Page 331 Figure 4
Page 331 # 1-3,5