2.  Motion-a change in position.  Position- where an object is at a specific time (including direction)  Ex. 7km North of Building A  Distance-interval of length – doesn’t include direction  Ex. I walked 14km  An object at rest is a special case of motion in which there is not change in position

3. Speed vs. Velocity  Speed-the distance an object travels over a certain amount of time  Speed is the rate of motion without direction  Rate-ratio between two different quantities (distance/time)  Units: m/s or km/hr  Formula: Speed =d/t (speed=distance/time)  Constant speed-the speed does not change  Instantaneous speed- the speed at a single instant/moment of time

4. Speed vs. Velocity

5. Position Graph

6. How does graphing fit in? (It’s never going to go away!)  Position vs. Time graphs show where things are at different times which makes it easy to see how things have moved.  EX: Moving AwayMoving to StartStopped (forward) (backward) (no motion) PPP TTT

7.  How can the motion of an object be changed?  Change how fast it is moving  Speed Up  Slow Down  Change direction *Note: Changing direction changes the velocity but not the speed. Changing Motion

8. Keep the graphing coming!!!  Distance vs. Time Graphs - show how long it takes an object to travel over a certain distance  Show the motion of objects over a period of time  Slope shows how speed changes at different places T DD D TT IncreasingDecreasingConstant

10. Velocity Graph

11. Velocity vs. Time Graphs- show how fast an object is traveling at a specific moment of time — Slope shows how an object is accelerating TT T VVV Even more Graphing…….awwww yeah!!! Positive Acceleration Negative Acceleration No Acceleration (constant velocity)

12. Discussion  In a position vs. time graph, what does a negative slope mean?  In a velocity vs. time graph, what does a negative slope mean?