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**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

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Speed & Velocity

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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)

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**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)

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**Speed – 2 types Instantaneous –rate at a given moment in time**

Example: speedometer in a car

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**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.

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**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.

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**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

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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

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**Recap Explain how speed is considered a rate.**

How does velocity differ from speed? What shows the speed on a distance-time graph?

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