1. How to read a motion graph.
Interpreting Motion
How to read a motion graph.

2. Position vs. Time Graphs
Stationary
Constant positive velocity
Constant negative velocity

3. Position vs.Time graphs
Changing velocity (increasing)
Changing velocity (decreasing)

4. If you want to know what the average velocity is calculate the slope.
Slope = Δd / Δt =Vave
Δd = df - di
Δt = tf - ti

5. Using slope to predict motion
On a position vs. time graph
If slope is 0, then velocity is 0.
If slope is positive, velocity is constant.
If slope is negative, velocity is constant in the opposite direction.
If slope is changing, velocity is changing. (i.e. you are accelerating)

6. Velocity vs. Time Graphs
The slope of the line tells you the ____________ of the object.
The “area under the curve” represents the change in position or ____________of an object.
displacement
acceleration

7. For t = 0s to t = 3 s velocity stays at 50 m/s.
V (m/s)
For t = 0s to t = 3 s velocity stays at 50 m/s. 50
So acceleration is 0!
t (s)
-25
What is the velocity from t=3s to t=5s? Acceleration?
v = -25 m/s
a = 0 m/s2

8. Area = base × height Base = 3 s Height = 50 m/s Δd=150 m 3s × 50 m/s
V (m/s)
Area = base × height
Base = 3 s Height = 50 m/s 50
Δd=150 m
3s × 50 m/s
t (s)
-25