1. Graphing Motion: Page 70 QUESTION: What does a distance versus time graph show you? OBJECTIVE: Students will be able to construct and interpret a distance versus time line graph. VOCABULARY:distance versus time graphslope

2. Graphing Motion Write these questions onto page 70 SKIP ONE LINE BETWEEN EACH QUESTION 1.Which axis does distance and time go on? 2.What does a steep line mean? 3.What does a horizontal line on the graph mean?

3. Distance versus time graph A distance versus time line graph shows the speed of an object.distance versus time line graph On this type of graph, time must be on the x-axis and distance must be on the y-axis. When making this type of graph be sure to label each axis with a proper unit. distancedistance Time kmkm hours

4. Slope Slope is the steepness of the line The steeper the line, the greater the speed. The graph shows that Car 3 has a greater speed than Car 1 and Car 2. distancedistance Time kmkm hours Car 3 Car 2 Car 1 100 80 60 40 20 0 1 2 3 4 5 6 7 8 9 10

5. Reading a distance versus time graph A straight line on a distance versus time graph shows constant speed (cruise control) Car 1 A horizontal line shows that the object is not moving. Car 2 is parked. distancedistance Time kmkm hours Car 1 Car 2 100 80 60 40 20 0 1 2 3 4 5 6 7 8 9 10

6. Interpreting the graph Most objects don’t go a constant speed. So most distance versus time graphs are not straight lines. distancedistance Time kmkm minutes A Trip to the Mall 100 80 60 40 20 0 1 2 3 4 5 6 7 8 9 10 Think of a trip to the mall. First, you go slow down your street. Then you go faster down the main street. You may stop because of a red light. You drive some more and then you arrive at the mall. Finally, you park.

7. distancedistance Time kmkm minutes 100 80 60 40 20 0 1 2 3 4 5 6 7 8 9 10 Review: Draw the graph below Distance must be on the y-axis and time must be on the x-axis. Include the proper units. A straight line shows a constant speed. Car 1 The steeper the line, the greater the speed. Car 2 A horizontal line shows the object is not moving. Car 3 Car 1 Car 2 Car 3 Car 4 What is happening to Car 4?

8. Graphing Motion: page 70 Check that the answers to these questions are in your notes. 1.Which axis does distance and time go on? 2.What does a steep line mean? 3.What does a horizontal line on the graph mean?

9. VOCABULARY Distance versus time graph- a graph that shows the motion of an object. Slope-the steepness of a line