1. Speed Chapter 10.1

2. Speed Speed describes how fast an object moves.

3. Speed measurements involve distance and time The SI unit for speed is expressed as meters per second (m/s). Speed is sometimes expressed in other units, such as kilometers per hour (km/h) or miles per hour (mi/h).

4. Constant Speed When an object covers equal distances in equal amounts of time, it is moving at a constant speed. Constant speed means that the speed does not change.

5. Graphing speed For distance/time graphs, time is the independent variable, since time will keep going whether or not any distance is traveled. Therefore it is on the x-axis The dependent variable, is distance, because distance traveled depends on the amount of time the object is moving, and should be plotted on the y-axis. TIME (S) DistanceDistance (m)

6. Constant Speed An object moving at a constant speed is a straight line on a distance-time graph

7. Calculate Speed You can calculate the speed by finding the slope of the line What is the speed? 10 m/s

8. Faster speed = steeper slope

9. Which Runner Won the Race? Albert- he reached 100 m 1st

10. Describe Charlie’s motion from 8 seconds to 13 seconds. He is standing still because there is no change in distance for that period of time

11. Who is running with the greatest average speed? Albert because he went the same distance over the shortest period of time

12. From 2 seconds to 8 seconds, which runner had the fastest speed? Charlie- because he had the steepest slope