1. MOTION
A review

2. Key Concepts What is motion? What is speed?
How do you calculate speed?
What is the difference between speed and velocity?
How can speed be graphed?

3. What is motion?
When an object changes position over time when compared with a reference point

4. Reference Point The object that stays in place to compare motion
What is the reference point in the picture?

5. 1 km North
1.Sandy needs to run errands. She walks 5 km north to return some movies. She keeps going north 3 km to buy groceries. She walks back south to her house. After 7 km she decides to stop at Starbucks.
Where is she from her house?

6. 21 km North
2. Jose drives 20 km north to downtown after dinner he walks 1 km south to the ballpark. After the game he walks 2 km north to his friend’s house.
Where is he compared to his house?

7. What is speed?
The rate at which an object moves. It depends on the distance traveled and the time taken to travel that distance.

8. Average Speed Average Speed = Total distance Total Time
Example: 360km = 90km
4hrs Hr.

9. 3. A plane traveled 600 km in 2 hours. How fast was it traveling?
300 km/hr

10. 4. Juan kicked a soccer ball 35m down field
4. Juan kicked a soccer ball 35m down field. The ball had a speed of 10m/s. How long did it take to get there?
3.5s

11. 4 hours
5. Julieta walked 20 km at 5 km/hr. How long did it take her to finish the race?

12. What is the difference between speed and velocity?

13. Velocity is
Speed
with
direction

14. What are some units for velocity?
600 km/min North
8 m/s south
65 mph west

15. When does velocity change?
Velocity changes as Speed or Direction changes

16. Changes in Velocity: or slower Velocity changes when speed goes faster
Velocity changes when direction changes
2m/sec up to 2m/sec down
You can’t move in a circle and keep the same velocity

17. Sample Problem 6
Juan is walking 2 m/s South on a train that is moving 60 m/s North. What is his velocity?
60-2 = 58m/s north

18. Sample problem 7
Jessica walks 3 m/s west to the front of a bus moving 30m/s west. What is her velocity?
30 + 3= 33 m/s west

19. How can speed be graphed?
2 ways
1. On a distance vs. time graph
2. On a speed vs. time graph

20. What is the MOST important thing when reading a motion graph?
Knowing what kind if graph it is!

21. Distance vs. time graphs
You can read the distance directly

22. 8. How far is the car moving between seconds 40 and 60?
0m/s

23. Distance vs. time graphs
You can calculate the speed
Slope=speed

24. 9. What is the speed of the object?
50/5= 10 m/s

25. Speed vs. time graphs
You can read the speed

26. What is happening to the speed?
increasing

27. 10. What is the speed between 3 and 7?
2km/min

28. You can calculate the acceleration Slope=acceleration
Speed vs. time graph
You can calculate the acceleration
Slope=acceleration