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

2. Measuring Motion

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

4. Displacement – change in position
School
Displacement – change in position
Wal-Mart
Displacement also has DIRECTION.
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5. d v t distance time (m/s) speed = B. Speed – how fast an object moves.*
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B. Speed – how fast an object moves.
1. Rate of motion d
Distance traveled per unit of time v t
distance
time
(m/s)
speed = *

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

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

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

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