1. Warm Up
Convert!
15 inches = _____ cm
360 years = ____ hours  

2. Motion Definition: When an object changes position Position depends on
The Frame of Reference

3. Frame of Reference Frame of Reference = point of view
Motion is a change in position relative to
a frame of reference

4. If you are standing in one place, and your friend walks by you, are you moving relative to your friend?
Is your friend moving relative to you?
Answer
You are moving relative to your friend, and your friend is moving relative to you!

5. If you and your friend are walking down the hall together at the same speed, in the same direction, are you moving relative to your friend?
Is your friend moving relative
to you?
Are either of you moving
relative to the earth?

6. Answer
You are NOT moving relative to your friend, and your friend is NOT moving relative to you. You both are moving relative to the earth.

7. Speed The distance an object travels per unit of time (Example: m/s)
Equation Speed = Distance ÷ Time
Instantaneous Speed: speed at one moment

8. Example
Example: A car travels 300km in 6 hours. What is the speed of the car?

9. Example
How far can a plane travel if it flies 800km/hr for 9 hours?

10. Another Example
How long does it take a ship to go 500 km if it travels at a speed of 50km/hr?

11. Average Speed How quickly an object traveled a specific distance
Average speed (m/s) = total distance (m)
total time (s)

12. Example
What is the average speed of a car that travels a distance of 750 m in 25 sec?

13. Velocity The speed and direction of motion
Example: a hurricane
Objects have different velocities IF:
They have different speeds Or
The are moving in different directions
Velocity changes if:
-Speed or direction changes

14. When would it be important to know velocity instead of speed?

15. Example
What is the velocity of a boat that travels south from St. Peter to Mankato (10 miles) in 15 minutes?