1. Physics Unit P2: One Dimensional Motion
Motion Graphs
Physics Unit P2:
One Dimensional Motion

2. Position-Time Graphs
A motion with constant, positive velocity results in a line of constant and positive slope when plotted as a position-time graph. .

3. Position vs. Time Graphs
A motion with changing, positive velocity results in a line of changing and positive slope when plotted as a position-time graph
                                                                   
                                               
If the position-time

4. Slope
The slope of the line on a position-time graph reveals useful information about the velocity of the object.
It's often said, "As the slope goes, so goes the velocity."
Whatever characteristics the velocity has, the slope will exhibit the same (and vice versa). If the velocity is constant, then the slope is constant (i.e., a straight line). If the velocity is changing, then the slope is changing (i.e., a curved line). If the velocity is positive, then the slope is positive (i.e., moving upwards and to the right).

5. Check out the slopes! Slow, Rightward (+) Constant Velocity
Fast, Rightward (+) Constant Velocity
                    

7. Negative Velocity?
Velocity is negative when the direction changes!! When an object slows down, it’s just a smaller magnitude.
Slow, Leftward (–) Constant Velocity
Fast, Leftward (–) Constant Velocity
                    

8. Position vs. Time at Rest
Horizontal line indicates an object is at rest.

9. Overlapping Graphs

10. Principle of Slope
The principle of slope: This principle states that the slope of the line on a position-time graph is equal to the velocity of the object.
Make sure to pick 2 points

11. Try this! Velocity =?

12. Make sure to pick 2 points, the object did not start at 0.
Answer
4 m/s!
Make sure to pick 2 points, the object did not start at 0.

13. Velocity - Time Graphs Velocity = d/t
A constant, positive velocity results in a line of zero slope.
Velocity = d/t

14. With changing, positive velocity results in a diagonal line when plotted as a velocity-time graph. (Acceleration)
                                                                   
                                              If the velocity-time data

15. In conclusion… Positive Velocity Zero Acceleration
Positive Velocity Positive Acceleration
                   

16. Positive and Negative Slope
Positive Direction Negative Direction

19. Describe this motion to the person sitting on your left.

21. Describe the motion this graph represents to a friend or classmate.

23. Position vs. Time Sketches
Positive Velocity Constant Velocity
Positive Velocity Changing Velocity (acceleration)
                    

24. Principle of Slope
The slope of the line on a velocity vs. time graph is equal to the acceleration of the object. Acceleration = 10 m/s2