1. Accelerated Motion
Chapter 3

2. Acceleration
Section 3-1

3. Changing Velocity
Uniform motion is smooth and unchanging, non-uniform motion causes the feeling of a push or pull
Motion diagrams for objects with changing velocity will not be constant
Example: page 58

4. Velocity-Time Graph Velocity-Time Graph – graphs velocity vs. time
Velocity on the Y-axis
Time on the X-axis
Acceleration – the rate at which an objects velocity changes

5. Acceleration
Average Acceleration – the change in velocity divided by the time interval
Instantaneous Acceleration – the change in velocity at an instant in time
Can be found by drawing a tangent line on a velocity-time graph

6. Acceleration on a Motion Diagram
The difference in velocity vectors in a motion diagram will show you the acceleration
Example: page 60

7. Positive and Negative Acceleration
Positive acceleration – an increase in speed in the positive direction, or a decrease in speed in the negative direction
Negative Acceleration – a decrease in speed in the positive direction, an increase in speed in the negative direction
Page 61 Figure 3-7

8. Determining Acceleration from a Velocity-Time Graph
Page 62 Figure 3-8
Line A – Positive Velocity, 0 Acceleration
Line B – Positive Velocity, Positive Acceleration
Line C – Positive Velocity, Negative Acceleration
Line D – Negative to Positive Velocity, Positive Acceleration
Line E – Negative Velocity, 0 Accleration

9. Calculating Acceleration
The acceleration of an object can be found by the slope of a velocity-time graph
Average Acceleration – equal to the change in velocity, divided by the time it takes to make that change
Example Problem 2