1. Speed and Velocity

2. Speed
Speed is the ratio of the distance an object moves to the amount of time it takes the object to move

3. Speed cont.
If you are traveling 60 miles and it takes you an hour to get from point A to point B… you would be traveling at 60 miles per hour

4. Average speed is computed for the entire duration of a trip

5. Average speed cont.
When traveling, you often vary your speed Average speed can be calculated by dividing the total distance you traveled by the amount of time it takes you to travel

6. Average Speed cont.
Imagine you are driving to Raleigh and it takes you 2 hours. The distance to Raleigh is 120 miles 120 miles / 2 hours = 60 miles/ 1 hour Your average speed was 60mph

7. Graphing Motion
You can graph motion by plotting an object’s Distance vs. time

8. Graphing cont.
The slope of a line on a distance-time graph is speed

9. Graphing cont.
You calculate slope by dividing the change in distance by the change in time

11. Graphing cont.
If an object has constant acceleration, it’s graph will look like this…

12. Graphing cont.
If an object has varying speed, its graph will look like this:

13. Graphing cont.
If speed varies, an object can either: Have constant speed Accelerate Decelerate

14. Between 20-40 mins – Constant speed Between 40-60 mins Acceleration Between 60-100 mins deceleration

15. Velocity
You also need to know the direction that an object is moving in Velocity is a description of both speed and direction of motion

16. Velocity cont.
Example: If you are traveling south at 60mph your velocity would be: 60 mph South