1. Speed and Velocity Average speed Velocity Predicting the future 1524
Outline
1524
2761
Mdcl1
Mdcl!

2. Average Speed Distance traveled Average speed = Time spent travelingOR
Not a vector!
Not a vector!

3. Example 1 – Average Speed
Example 1 – Av Speed
Example 1 – Average Speed
If a car travels 100 km/h for an hour, and then travels 50 km/h for an hour. The average speed is given by:

4. Average Velocity Displacement Average velocity = Time spent travelingOR
Vector!
Vector!

5. Example 2 – average velocity
QQ6 Av Speed
Example 2 – average velocity
A particle moving along the x-axis is located at xi=12m at t1=1s and at xf=4m when tf=3s. Find its displacement and average velocity during this time interval.

6. Example 3 – average velocity
QQ6 Av Speed
Example 3 – average velocity
The position of a particle moving along the x-axis varies in time according to the expression x=3t2, where x is in m and t in s.
Find the displacement and the average velocity for the particle between t=1s and t=4s

7. QQ7 Av Speed
Quick Quiz
An athlete swims the length of a 50m pool in 18s and then makes the return trip to the starting position in 20s.
Determine his average velocity in the second half of the swim:
0 m/s
2.5 m/s
-2.5 m/s
-5 m/s

8. Position from Velocity
but  

9. Example An object starts at r1=3m. It is moving with an
QQ7X vector equation
Example
An object starts at r1=3m. It is moving with an
average velocity of vavg= 2m/s. What is its position after a time interval of Δt=5s?
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