1. Drag racing videohttp://www.youtube.com/watch?v=ryDYYGI1cwg
Speed and Velocity
Drag racing videohttp://

2. example: radar gun, speedometer
speed describes how quickly something moves.
There are 4 different types of speed
instantaneous speed – how fast you are going at a certain point or time.
example: radar gun, speedometer

3. 2. average speed – looks at the average speed between two points or times.
example: driving from Olympia to Seattle
what we will calculate in this class

4. 3. constant speed – speed stays the same example: cruise control
the slope of a line is the ratio of the “rise” to the “run”. The steeper the slope, the greater the speed.

5. Peregrine Falcon video
Terminal speed (velocity) – the speed at which an object will stop accelerating when dropped
example: a sky-diver
Peregrine Falcon video

6. velocity is speed with direction (N, S, E, W, up, down, left, right)
They Might be Giants clip

7. Math for Velocity (or Speed)
v = d/t or v = d ÷ t
v = velocity (speed)
d = distance
t = time
Unit of measurement is a distance unit over a time unit
cm/s, m/s, miles/hour, ft/year
if a velocity, should include direction (N, S, E, W)

9. 5-Step Method to Solving Word Problems in Physical Science
Identify what you know (given)
Write down the correct formula to use
Show your work (“plug and chug” using calculator)
Write down answer
Make sure answer has a unit of measurement

10. Example problems
A bike travels 70 meters West in 6.5 seconds. Calculate its velocity.
A car travels a distance of 100 miles in 2.2 hours. Calculate its speed.
Given formula show work answer w/ units
d=70m v=d/t
t=6.5sec
70m/6.5sec
10.8 m/sec West
Given formula show work answer w/ units
d=100 miles v=d/t
t=2.2 hours
100miles/2.2hours
45.5 miles/hour

11. Find the average speed at points A, B and C