1. Mechanics (Kinematics)
Constant Velocity
Zero acceleration

2. Review of Variables
These are all the variables you may see in Mechanics problems
Xi - initial position (m)
Xf - final position (m)
Vi - initial velocity (m/s)
Vf - final velocity (m/s)
a – acceleration (m/s2)
t – time (s)

3. Constant Velocity
Key Point: Acceleration is always 0, but velocity will not be 0. or
The object is still moving, but velocity is unchanging.

4. Equation
Displacement (m) = velocity (m/s) * time (sec)
Δx = v t

5. Example
During a race on level ground, Andra runs with an average velocity of 6.02 m/s to the east. What is Andra’s displacement after 137 s?

6. Example
During a race on level ground, Andra runs with an average velocity of 6.02 m/s to the east. What is Andra’s displacement after 137 s?
Givens:
v = 6.02 m/s
t = 137 sec

7. Example
During a race on level ground, Andra runs with an average velocity of 6.02 m/s to the east. What is Andra’s displacement after 137 s?
Givens:
v = 6.02 m/s
t = 137 sec
Formula Δx = v t → Δx = (6.02m/s)(137s)

8. Example
During a race on level ground, Andra runs with an average velocity of 6.02 m/s to the east. What is Andra’s displacement after 137 s?
Givens:
v = 6.02 m/s
t = 137 sec
Formula Δx = v t → Δx = (6.02m/s)(137s)
Solution: Δx = 825 m to the East

9. Practice
For classwork, complete Practice A on page 44 in your textbook.