1. Linear Motion
Chapter 2.1

2. Motion is Relative Everything moves
It just depends how you look at something

3. Distance vs. Displacement
How far an object moved from its original location
Displacement
How far an object is from the starting point

4. Speed Measure of how fast something is moving Rate:
Distance/time (read: distance per time)
Common units: m/s (meters per second)

5. Instantaneous Speed The speed of an object at that particular instant
If your driving your car, your speedometer tells you your instantaneous speed

6. Average Speed Average speed = total distance covered
total time interval

7. Practice Problem 1
If I drive 100 km in 2 hours, what is my average speed?

8. Answer 1:
100 kilometers/2 hours = 50 km/h

9. Practice Problem 2: Minute 1: car is stopped and parked
Minute 2: car is driving 60 mph
Minute 3: car is driving 45 mph
Minute 4: car is driving 30 mph
Minute 5: car is stopped at a stop sign.
If the car only traveled 2.5 miles, what is the average speed of the driver in miles/minute?

10. Answer 2:
2.5 miles/5 minutes = .5 miles/minute

11. Practice Problem 3
On my way up north, I got stuck in a traffic jam where we were driving an average speed of 20 mph for 2 hours. How far did I travel during that time?

12. 20 miles/hour = distance/ 2 hours
Distance= 40 miles