1. Matter in Motion

2. Motion Object changes position over time compared to a reference point
Object that appears to stay in place
Reference distance
Description of the direction of motion

3. Reference point and direction
Examples include: mountains, buildings, trees, non moving objects
Directions are usually describe as North, South, East, West, up and down

4. Speed Rate at which an object moves
Depends on time taken and distance traveled

5. Speed
Total distance
Average speed=
Units are in meter per second, miles per hour. Always a distance per time.
Total time

6. What is the average speed if you take .5 hr to walk 4000m?
Example Problems
What is the average speed if you take .5 hr to walk 4000m?

7. What is the average speed if you take .5 hr to walk 4000m?
Example Problems
What is the average speed if you take .5 hr to walk 4000m?

8. Example Problem
If average speed of a car is 110km/hr, how long will it take the car to travel 715 km?

9. Now work on Math Break page 109

10. Velocity Rate of change of an object’s position
Speed of an object in a particular direction
Always includes reference direction
Velocity changes as speed or direction changes

11. Answer Self Check question
Pg 110
Which of the following are examples of velocity?
25m/s forward 2)1500 km/h
3) 55 m/h ) all of the above

12. Combining Velocities
Combine two velocities in same direction by adding for resultant velocity
Combine two velocities with opposite direction by subtracting the smaller velocity from the larger velocity for the resultant velocity.
Resultant Velocity is in the direction of the larger velocity

13. Final velocity – starting velocity Time it takes to change velocity
Acceleration
Rate at which velocity changes
Tells you how fast velocity changes
Acceleration =
Final velocity – starting velocity
Time it takes to change velocity

14. Positive and Negative Acceleration
Positive acceleration is when acceleration is increasing
Negative acceleration or deceleration is when acceleration is decreasing
Note: a change in direction is acceleration even if there is no change in speed