To the teacher: This CPO Science PowerPoint presentation is designed to guide you through the process of presenting the lesson to your students. The presentation uses a 5-E teaching model: Engage, Explore, Explain, Elaborate, and Evaluate. The PowerPoint Slide notes indicate where you may want to bring in various lesson elements such as quizzes, readings, investigations, animations, and practice materials. Additional science background information is provided in the slide notes where appropriate. You can view these notes by selecting “View,” then “Normal.” You will see the notes pane at the bottom of the PowerPoint workspace. Additionally, the slide notes are available as a separate document, accessible from the lesson home page. The slides that follow are intended for classroom use. About the slide notes: The slide notes for this presentation are available in a separate document that you can print and look at while you use the slides. You can access the slide notes document from your teacher lesson home page. Enjoy the lesson!

Let’s take a road trip Christopher borrowed his mother’s car to run a quick errand. You can use this motion graph to answer questions about his trip. 1. How far did Christopher’s car travel between points A and B? How much time did it take? 2. What is the speed of the car between points A and B? Is this when he is traveling fastest? How can you tell? 3. Describe the motion of the car between points B and C. 4. What does a negative slope mean? ENGAGE: In this activity, students analyze a motion graph. Give students time to work on the answers to the questions in groups. Discuss the answers as a class. Note: Since more information can be interpreted from this graph, you may wish to come up with more questions. Here are the answers to the questions on the slide: (1) 150 meters and 15 seconds; (2) The car traveled 150 meters in a 15-second period, so the speed of the car is 10 m/s, and yes, he is traveling fastest here because this is where the slope of the line the steepest; (3) Christopher’s car is at rest between points B and C, and the car did not move any distance from its point of origin so the speed of the car is at zero; and (4) A negative slope means the car is traveling opposite its original direction. At point G, Christopher has returned to his original position.

Time to investigate! Complete the lesson investigation: Position, Speed, and Time Graphs EXPLORE: Lead the lesson investigation: Position, Speed, and Time Graphs

Comparing the graphs These two graphs show the motion for two objects. A position vs. time graph shows speed. The two objects are moving at a constant speed. A speed vs. time graphs shows the acceleration. Both objects have zero acceleration. EXPLAIN: Go over the differences between these two motion graphs. Ask students to identify the faster object and explain their answer (“blue” is faster). Ask students what the speed vs. time graph would look like if the acceleration of “red” stayed zero, but the acceleration for “blue” increased over time.

What else can you learn? A steeper line ( = greater slope) on a position vs. time graph means a faster speed. A speed vs. time graph can be used to find the distance the object has traveled. EXPLAIN: Motion graphs contain a good deal of information. This slide points out that you can compare speeds and calculate distance traveled from these graphs. Review slope with your students. Slope is the ratio of the rise (vertical change) to the run (horizontal change) of a line on a graph. Go over the formula for calculating distance traveled using a speed vs. time graph.

Time for Practice! Which of the speed vs. time graphs matches this position vs. time graph? Now, complete the lesson practice activity: Analyzing Graphs of Motion with and without Numbers ELABORATE: The answer is speed vs. time graph B matches the position vs. time graph. The position vs. time graph shows constant speed for 2 seconds (zero acceleration) and then stopping for 3 seconds (zero speed). Students can continue to practice their skills with these graphs by completing the practice activity.

Show what you know! Try the lesson’s interactive quiz, or complete a quiz that your teacher can print out for you. Hint: You might want to review your lesson reading piece one more time before trying the quiz. EVALUATE: Print out the 10-question quiz for students to complete, or have students work individually at computers to complete the interactive quiz they can access from the multimedia lesson home page.