Focused Learning Lesson Science Grades 9-12 PS-H-E2
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1 Focused Learning Lesson Science Grades 9-12 PS-H-E2 Overview: This lesson is designed to review the basic relationships of speed, velocity, and acceleration. During the lesson, students will review the definitions of speed, velocity, and acceleration, perform calculations of velocity and acceleration from a given set of data, and plot the results as a distance vs. time graph and a velocity vs. time graph. Review sheets, data sheets, prepared graph paper, and correct answers are included. Approximate Duration: 45 minutes Benchmark: PS-H-E2 understanding the relationship of displacement, time, rate of motion, and rate of change of motion; representing rate and changes of motion mathematically and graphically GLEs: 31. Differentiate between speed and velocity. 32. Plot and compare line graphs of acceleration and velocity. 33. Calculate velocity and acceleration using equations. Benchmark: SI-H-A3 using technology and mathematics to improve investigations and communications SI GLE: 5. Utilize mathematics, organizational tools, and graphing skills to solve problems. Objectives: 1. The student will define speed and velocity and their formulas. 2. The student will calculate velocity and acceleration using equations. 3. The student will plot and compare line graphs of velocity and acceleration. Teacher Preparation: The teacher should read all instructions before beginning and then make copies of the worksheets included for each student. See Attachment 1: Teacher Background. Materials/Equipment/Resources: Copies of worksheets for each student. Pencil Calculators (optional) Lesson Procedures: Set or Opener: The teacher can introduce the lesson with a discussion on what are the difference between speed, velocity, and acceleration and how do we illustrate the movement of an object. See Attachment 1, Teacher Background. Science Focused Learning Lessons 125
2 Body of the Lesson: 1. Begin with a review the basic definitions of speed, velocity, and acceleration. Allow for student questions and discussion. Use a toy car or a rolling ball to demonstrate each definition. See Attachment 2: Handout 1, Definitions. 2. Divide the class into groups of two or three and allow the students to complete Handout 2 (Attachment 4). Calculators are optional for this activity. 3. Instruct students to use their calculation results to plot on the appropriate graphs. See Attachment 3: Handout 2, the second page. 4. Instructed to answer the analysis section at the end of Handout 2, when they have completed the plotting their graphs. Closure: The teacher should now present the answers for the students to check their work. To present the answers, use a transparency and demonstrate of calculations. Attachment 5 may be used as a master for the transparency. Sample quiz questions are included in Attachment 6. Attachments: Attachment 1: Teachers Background Attachment 2: Handout 1, Definitions Attachment 3: Key to Handout 1 Attachment 4: Handout 2, Calculations and Graphing Attachment 5: Key to Handout 2 Attachment 6: Sample Quiz Sample Assessment Items: Students worksheets and plots may be used as assessment tools. Sample quiz questions are also provided in Attachment 6, Quiz. Reference Links and Technology Connections: The Physics Classroom. Available online at Science Focused Learning Lessons 126
3 Attachment 1 Teacher Background Before the lesson, the teacher should prepare a copy of the handouts for each student. At the beginning of the class, the teacher can introduce the lesson with such questions as: 1. How do we find out how fast we travel when we go from Baton Rouge to New Orleans, which is 50 miles away, in 1 hour? 2. What is the difference between speed and velocity? 3. What does it mean when we say accelerate? 4. Is there such a thing as negative acceleration? 5. If so, what is a negative acceleration? For more information on speed, velocity, and acceleration and graphing, the teacher may want to see the following website for a tutorial: This website may also be assigned as a follow-up for students. Science Focused Learning Lessons 127
4 Science Focused Learning Lessons 128
5 Attachment 2 Handout 1: Definitions DIRECTIONS: Fill in the blanks with the correct terms. 1. is defined as the rate of motion or how fast an object moves. 2. To find speed, you must measure both distance traveled and the time it took to travel that distance and then use the formula: (words) Speed (s) = = _ d (symbols) (words) t 3. If distance is measured in meters and time is measure in seconds, then speed would have the units of measurement of. 4. Speed can also be determined from a vs. graph. 5. describes both the speed and direction of a moving object. 6. Label the following units of measurement as speed or velocity units: a. 30 meters/second left c. 45 meters/second b. 25 km/hr East d. 6 miles/hour 7. Speed and velocity that does not change during an interval of time are said to be. 8. speed ( or velocity) is the speed (or velocity) at a particular moment in time. 9. is a change in velocity during a amount of time; that is, a change in or or both. 10. Acceleration is calculated with the formula: (supply the word formula) Acceleration (a) = - = V f - V i t Science Focused Learning Lessons 129
6 11. Acceleration can be determined from a vs. graph. 12. Acceleration that is increasing is aid to be. 13. Acceleration that is decreasing to said to be. 14. Identify the following graphs as: A. Speed or Acceleration graph B. Increasing or Decreasing 1) 2) A. B. A. B. 3) Speed A. B. 4) Speed A. B. Science Focused Learning Lessons 130
7 Attachment 3: Definitions Handout 1: KEY DIRECTIONS: Fill in the blanks with the correct terms. 1. Speed is defined as the rate of motion or how fast an object moves. 2. To find speed, you must measure both distance traveled and the time it took to travel that distance and then use the formula: Speed (s) = traveled = of d t 3. If distance is measured in meters and time is measure in seconds, then speed would have the units of measurement of meters/seconds. 4. Speed can also be determined from a distance vs. time graph. 5. Velocity describes both the speed and direction of a moving object 6. Label the following units of measurement as speed or velocity units: a. 30 meters/second left velocity b. 45 meters/second speed c. 25 km/hr East velocity d. 6 miles/hour speed 7. Speed and velocity that does not change during an interval of time are said to be constant. 8. Instantaneous speed (or velocity) is the speed (or velocity) at a particular moment in time. 9. Acceleration is a change in velocity during a amount of time; that is, a change in speed or direction both. 10. Acceleration is calculated with the formula: Acceleration (a) = final velocity initial velocity = time 11. Acceleration can be determined from a speed vs. time graph. V f - V i t Science Focused Learning Lessons 131
8 12. Acceleration that is increasing is said to be positive acceleration. 13. Acceleration that is decreasing to said to be negative acceleration. 14. Identify the following graphs as: A. Speed or Acceleration B. Increasing or Decreasing 1) 2) A. speed A. speed B. increasing B. decreasing 3) East 4) South Speed Speed A. acceleration A. acceleration B. decreasing B. increasing Science Focused Learning Lessons 132
9 Attachment 4: Calculations and Graphs Handout 2 Sam went riding with some friends one afternoon. They kept a chart of their journey of how far they traveled after certain times. The data chart is presented below. Using this information, plot (graph) their journey on the distance vs. time graph and answer the questions below. traveled (kilometers) (hours) :00 noon 1:00 2:00 3:00 4:00 5:00 Graph of vs. 100 traveled in kilometers : in hours (PM) Questions to consider: 1. What was the average speed over their entire journey? 2. Between which hours were they going the fastest speed? 3. What was their speed at 2:30 PM? 4. Are they traveling at a constant speed during their journey? Science Focused Learning Lessons 133
10 Directions: Using the distance and times for their journey, 1. calculate the speed and acceleration for each hour (show your work), 2. plot the acceleration on a speed vs. time graph below, and 3. answer the questions below. (hours) Speed (kilometers (km/hr) Graph of Speed vs. Acceleration (km/hr/hr) Speed in km/hr : in hours (PM) Questions to consider: 1. Was there a constant acceleration during the journey? Explain your answer. 2. When was there a positive acceleration? 3. When were they traveling at a constant speed? 4. When were they going at a negative acceleration? 5. When they positively accelerate the greatest? Science Focused Learning Lessons 134
11 Attachment 5: Calculations and Graphs Handout 2: Key Sam went riding with some friends one afternoon. They kept a chart of their journey of how far they traveled after certain times. The data chart is presented below. Using this information, plot (graph) their journey on the distance vs. time graph and answer the questions below. traveled (kilometers) (hours) :00 noon 1:00 2:00 3:00 4:00 5:00 Graph of vs. 100 traveled in kilometers : in hours (PM) Questions to consider: 1. What was the average speed over their entire journey? 100 km /5 hr = 20 km/hr 2. Between which hours were they going the fastest speed? Between 1:00 and 3:00 3. What was their speed at 2:30 pm? 55 km/hr 4. Are they traveling at a constant speed during their journey? No Science Focused Learning Lessons 135
12 (hours) Directions: Using the distance and times for their journey, calculate the speed and acceleration for each hour (show your work), plot the acceleration on a speed vs. time graph below, and answer the questions below. Speed (kilometers (km/hr) Acceleration (km/hr/hr) /1 = 10 (10-0)/1= /1=30 (30-10)/1= /1=30 (30-30)/1= /1=20 (20-30)/1 = /1=10 (10-20)/1 = -10 Graph of Speed vs. Speed in km/hr : in hours (PM) Questions to consider: 6. Was there a constant acceleration during the journey? Explain your answer. No, the line is not straight. 7. When was there a positive acceleration? between 12:00 and 2:00 PM 8. When were they traveling at a constant speed? between 2:00 and 3:00 PM 9. When were they going at a negative acceleration? After 3:00 PM 10. When was positive acceleration the greatest? between 1:00 and 2:00 PM Science Focused Learning Lessons 136
13 Attachment 6 Sample Quiz Multiple Choice 1. The velocity of an object tells A. speed. B. direction. C. speed and direction. D. speed, direction, and acceleration. Calculation 2. John rides his bike for 20 miles in 4 hours. What is his speed? Show calculations here. Graphing 3. Which of the following graphs shows an object that is at constant speed? A. B. C. D. Short Answer 4. Compare and contrast velocity and acceleration. Key: 1. - C, miles/hour, 3. C, and 4. - Velocity is how fast an object is moving while accelerating is how fast the velocity is changing. Science Focused Learning Lessons 137
14 Science Focused Learning Lessons 138
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