1. MOTION

2. Are you moving?  An object is in motion if its distance from another object is changing.

3. Reference Points  A place or object used for comparison to determine if something is in motion  An object is in motion if it changes positions relative to a reference point

4. Choosing Reference Points  Good reference points are stationary  Trees, signs, buildings  What if the reference point is moving?

5. Relative Motion  Are you (as a whole) moving when you take notes  Relative to the door?  Relative to the sun? Earth moves about 30km/s

6. Calculating Speed  If you know the distance an object travel in a certain amount of time, you can calculate the speed of the object  Speed is a rate Speed = Distance/time

7. Examples  Cyclist travels 30 km in 2 hours  30km = distance  2 hours = time  Speed = 30km/2hr or 15km/h

8. Average Speed  Our cyclist goes slower up hill compared to downhill  32km the first 2 hours, and 13 km the next 1 hour  Total distance/total time = average speed  What is the average speed?

9. Instantaneous Speed  Rate at which an object is moving at a given instant in time  Cars speedometer

10. Velocity  A snow storm is traveling at a speed of 25 km/hr  Should we prepare for the storm?

11. Velocity  Depends on which way the storm is moving!  When you know both the speed and direction of an object’s motion, you know the velocity of the object  Speed in a given direction is called velocity  23 km/hr north