1. Unit II: Fast and Furious
Vocabulary
Speed: the ratio of the distance an object moves to the amount of time the object moves
Velocity: the speed and direction an object is moving, measured relative to a reference point
Average speed: the total distance traveled divided by the time it takes to travel that distance
Instantaneous speed: the rate at which an object is moving at a given moment

2. Speed & Velocity

3. GA Standard
S8P3. Students will investigate relationship between force, mass, and the motion of objects.
a. Determine the relationship between velocity and acceleration. (DOK 2)

4. Speed It is a rate! What does that mean?
A change over time. What is the change?
Change in position, in other words, distance.
Standard unit: meters per second (m/s)

5. Speed – 2 types Instantaneous –rate at a given moment in time
Example: speedometer in a car

6. Calculation Average speed – rate for the duration of an entire trip
This can be calculated…ready for the equation?
v = d/t
v – velocity
d – distance
t – time
What units do we use?
Try the practice problems.

7. Identify the Variables
1. A train travels 190 km in 3.0 hours and then 120 km in 2.0 hours.
2. A car travels 85 km from Town A to Town B, then 45 km to Town C. The entire trip took 1.5 hours.

8. Velocity What makes velocity different? It is a vector!
It is essentially speed (magnitude) and direction
3 ways to change velocity:
Change in speed
Change in direction
Change in both

9. Graphing Velocity
Velocity is demonstrated on a distance vs. time graph
The slope of the line demonstrates speed/velocity
The steeper the slope, the higher the speed

10. Recap Explain how speed is considered a rate.
How does velocity differ from speed?
What shows the speed on a distance-time graph?