2. Speed and Velocity

3. Distance vs. Displacement You drive the path, and your odometer goes up by 8 miles (your distance). Your displacement is the shorter directed distance from start to stop (yellow arrow). What if you drove in a circle? start stop

5. Speed Speed is distance / time or more accurately

6. Time What is time?

7. Constant speed A moving object that doesn’t change it’s speed travels at constant speed Constant speed means equal distances are covered in an equal amount of time

8. Constant speed Distance in cm Position Shown as a series of dots (center of mass image) 1 4 34 56 789101112 Time in seconds 256 What is the speed?

9. Constant speed Shown as a graph Time Position 3452 2 4 6 8 1 What is the speed of this object?

10. Calculating Speed Speed = Distance Time If a runner travels 100 m in 10 seconds what was his average speed? Probably not constant Can solve for the other pieces too Distance = speed x time Time = Distance Speed

11. Speed is a scalar quantity What is it missing?

13. instantaneous velocity - the velocity that something has at any one instance –(The terms instantaneous speed and avg. speed may also be used)

14. The average velocity for a trip might be 53 miles/hour. However, during this trip your instantaneous speed might have been 0 miles/hour at a stoplight or 70 miles/hour on the open road.

19. Show All Work Including The EquationS and Units SAWITESU An object is goes 30m North in 13 seconds. What is its velocity?

20. SAWITESU Key Concepts Speed = Velocity is a vector quantity: Speed and direction