1. How do you know something is moving? Question:

2. Measuring Motion

3. I. Observing Motion A. To observe motion, you need a reference point – a stationary object. Reference Point

4. 2.Displacement also has DIRECTION. School Home Wal-Mart 1.Displacement – change in position

5. B. Speed – how fast an object moves. 1. Rate of motion 2.Distance traveled per unit of time speed = distance time d tv (m/s)

6. 3. Instantaneous Speed – speed at a given instant 4. Average Speed: Average speed = Total distance Total time

7. Problem A bicycle rider has traveled 60 meters over the past 30 seconds. What is the average speed? d tv d = 60 m t = 30 seconds v = ? Given v = dtdt 60m 30 s v = = 2m/s Work

8. Problem A motorcycle travels at a speed of 100km/h for 2 hours. How far does she travel? d tv d = ? t = 2 hr v = 100 km/hr Given d = v x t d =(100 km/hr)(2hr)= 200 km Work

9. Problem How long will it take a person walking 2 m/s to travel 2000 meters? d tv d = 2000 m t = ? v = 2 m/s Given t = dvdv t = = 1000 s Work 2000 m 2 m/s Around 16 minutes