Slide 1

Go to section Pretest 1.How many meters are in 28 km? 2.Convert 35 km/h to a speed in m/s. 3.Rearrange the following equation to solve for d : v =. 4.Rearrange the following equation to solve for v f : a = (v f v i )/t. Chapter 11 Slide 2 Go to section Pretest (continued) 5.What are the SI units for distance and time? 6.Which of the following describes the slope of a line? a.rise x run b.run/rise c.run rise d.rise/run Chapter 11 Slide 3 Go to section Pretest (continued) 7.If a graph uses units of meters on the vertical axis and units of seconds on the horizontal axis, what would be the units of the slope of a line on the graph? 8.Which of the following is true about a curved line on a graph? a.The slope is the same at every point. b.The slope of the line may be different at every point. c.The line has no slope. d.The slope of the line is zero. Chapter 11 Slide 4 Go to section Interest Grabber Describing Motion Accurately describing the motion of an object using only words can be difficult. 1.Choose a destination near your home, such as school, a particular store, or a friends house. Write out a set of directions describing how someone would get from your home to the location. 2.Draw a map illustrating the directions you wrote out in Step 1. 3.Was it easier to write out the description or to draw the map? Which method is easier to use to find the location? Explain your answers. Section 11.1 Slide 5 Go to section Reading Strategy Predicting Section 11.1 a.Answers may vary. Sample answer: Frame of reference may mean the range of distances or area that you are considering in a problem. b. Frame of reference is a system of objects that are not moving with respect to one another. Frames of reference are important because they are needed to accurately describe motion. Slide 6 Go to section Distance: Displacements Along a Line Figure 3 Slide 7 Go to section Distance: Displacements Along a Line Figure 3 Slide 8 Go to section Distance: Displacements Along a Line Figure 3 Slide 9 Go to section Distance: Displacements Along a Line Figure 3 Slide 10 Go to section Distance: Displacements Along a Line Figure 3 Slide 11 Go to section Distance: Displacements Along a Line Figure 3 Slide 12 Go to section Interest Grabber Distance-Time Graphs The distance traveled by an object in a period of time often is expressed using a line graph. A line graph visually conveys information using sets of data points. Section 11.2 1.Copy the blank graph below on your paper. Complete the graph by plotting the given data points on the graph. Each set of data points represents (time, distance). Note that time is measured in seconds and distance is measured in meters. Connect the plotted points with a straight line. Data points: (0, 0), (2, 40), (4, 80), (6, 120), (8, 160), (10, 200) 2.Describe the motion shown on the graph. Slide 13 Go to section Reading Strategy Monitoring Your Understanding Section 11.2 Answers may vary. Sample answers shown below. a.Average speed is distance divided by time. c. Instantaneous speed is different from average speed. e.Velocity is not the same as speed. b.I could use this to calculate various speeds, like the average speed at which I travel getting to school. d.You cant use a single speedometer reading to determine how long a trip will take. f.This could be useful in giving directions or in describing the path that you take on a walk. Slide 14 Go to section Calculating Average Speed Section 11.2 Slide 15 Go to section Calculating Average Speed Section 11.2 Slide 16 Go to section Calculating Average Speed Section 11.2 Slide 17 Go to section Calculating Average Speed Section 11.2 Slide 18 Go to section Distance-Time Graphs for Motion of Three Cars Section 11.2 Slide 19 Go to section Distance-Time Graphs for Motion of Three Cars Section 11.2 Slide 20 Go to section Distance-Time Graphs for Motion of Three Cars Section 11.2 Slide 21 Go to section Interest Grabber Speed-Time Graphs The speed an object travels in a period of time can be expressed on a graph. This type of graph can give useful information about the objects motion. The speed-time graph of the object in Section 11.2 Interest Grabber is shown below. Section 11.3 1.Describe the speed of the object shown on the graph. 2.The slope of the line on a distance-time graph represents the change in distance (m) per the change in time (s). Thus, the slope of a distance-time graph gives speed (m/s). What information does the slope of a speed- time graph give you? 3.What is the slope of the line on the speed-time graph? Slide 22 Go to section Reading Strategy a. speed (or direction)b.direction (or speed) c.m/s 2 Section 11.3 Summarizing Slide 23 Go to section Measuring Acceleration Section 11.3 Slide 24 Go to section Measuring Acceleration Section 11.3 Slide 25 Go to section Measuring Acceleration Section 11.3 Slide 26 Go to section Measuring Acceleration Section 11.3 Slide 27 Go to section Speed-Time Graphs Figures 16 and 17 Slide 28 Go to section Speed-Time Graphs Figures 16 and 17 Slide 29 Go to section Distance-Time Graph of Accelerated Motion Figure 18 Slide 30 Pretest Answers 1.How many meters are in 28 km? 2.Convert 35 km/h to a speed in m/s. 3.Rearrange the following equation to solve for d : v =. 4.Rearrange the following equation to solve for v f : a = (v f v i )/t. Chapter 11 Click the mouse button to display the answers. 2800 m 0.97 m/s d = vt v f = at v i Slide 31 Chapter 11 Pretest Answers (continued) Click the mouse button to display the answers. 5.What are the SI units for distance and time? 6.Which of the following describes the slope of a line? a.rise x run b.run/rise c.run rise d.rise/run meters and seconds Slide 32 Chapter 11 Click the mouse button to display the answers. Pretest Answers (continued) 7.If a graph uses units of meters on the vertical axis and units of seconds on the horizontal axis, what would be the units of the slope of a line on the graph? 8.Which of the following is true about a curved line on a graph? a.The slope is the same at every point. b.The slope of the line may be different at every point. c.The line has no slope. d.The slope of the line is zero. m/s Slide 33 Interest Grabber Answers 1.Choose a destination near your home, such as school, a particular store, or a friends house. Write out a set of directions describing how someone would get from your home to the location. Possible answers must provide adequate instructions describing how to get from the home to the chosen location. 2.Draw a map illustrating the directions you wrote out in Step 1. Your maps must illustrate how to travel from home to the chosen location. 3.Was it easier to write out the description or to draw the map? Which method is easier to use to find the location? Explain your answers. Accept either response if students provide reasons. Students will most likely say that the map is easier to write and use. Section 11.1 Slide 34 Interest Grabber Answers 1.Copy the blank graph below on your paper. Complete the graph by plotting the given data points on the graph. Each set of data points represents (time, distance). Note that time is measured in seconds and distance is measured in meters. Connect the plotted points with a straight line. Data points: (0, 0), (2, 40), (4, 80), (6, 120), (8, 160), (10, 200) 2.Describe the motion shown on the graph. Possible answers include that the object is traveling at a constant speed and/or that the object traveled 200 meters in 10 seconds. Section 11.2 Slide 35 Interest Grabber Answers 1.Describe the speed of the object shown on the graph. The object is traveling at a constant speed of 20 m/s. 2.The slope of the line on a distance-time graph represents the change in distance (m) per the change in time (s). Thus, the slope of a distance-time graph gives speed (m/s). What information does the slope of a speed-time graph give you? The slope of a speed-time graph represents the acceleration of the objectits change in speed over the time. 3.What is the slope of the line on the speed-time graph? The slope of the line is 0. Section 11.3 Slide 36 Chapter 11 Go Online Data sharing Self-grading assessment For links on distance and displacement, go to www.SciLinks.org and enter the Web Code as follows: ccn-2111. www.SciLinks.org For links on motion, go to www.SciLinks.org and enter the Web Code as follows: ccn-2112.www.SciLinks.org For links on acceleration, go to www.SciLinks.org and enter the Web Code as follows: ccn-2113.www.SciLinks.org Slide 37 This slide is intentionally blank.