1. ______
Unit I: Kinematics

2. 1.1
The Language
of Motion

3. The player’s position is 5
The player’s position is 5.0 m east of the reference point (center ice).
The arrow indicates that position is a vector quantity, which includes both magnitude and direction.
3:10

4. The player moves a distance of 20.0 m.
The symbol without an arrow and no direction indicates that distance is a scalar quantity.
The player’s final position is now 25.0 m east of the reference point.

5. Δ = the Greek letter delta , which means “change in”
The player’s position has now changed. A change in position is called displacement.
Δ = the Greek letter delta , which means “change in”
Displacement is another example of a vector quantity.

6. Vector Sign Conventions
When using vector quantities in formulas, we do not write the directions using words.
Instead, we use positive (+) and negative (–) signs.
positive directions
negative directions
forward
backward up
down
right
left
east
west
north
south

7. The person begins 5.0 m [W] of the bus stop sign.
Δd = 5.0 m m
= (+10.0 m) – (–5.0 m)
Δd = m
= m
This person travelled a distance of 15.0 m and her displacement is 15.0 m east.

8. Example 1.1

9. Homework: read pages 4 – 10 Practice Problems pg. 9
1.1 Check and Reflect
pg. 10 #’s 1 – 7