2 Motion BIGIDEA Write the Big Idea for this chapter.

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1 2 Motion BIGIDEA Write the Big Idea for this chapter. Use the What I Know column to list the things you know about the Big Idea. Then list the questions you have about the Big Idea in the What I Want to Find Out column. As you read the chapter, fill in the What I Learned column. K What I Know W What I Want to Find Out L What I Learned 17

2 2 Motion 1 Describing Motion 2(D), 4(A), 4(B) MAINIDEA Write the Main Idea for this lesson. REVIEW VOCABULARY meter Recall the definition of the Review Vocabulary term. meter NEW VOCABULARY motion distance displacement speed average speed instantaneous speed Use your book to define the words below. motion distance displacement ACADEMIC VOCABULARY position speed Contrast the average speed and the instantaneous speed of a runner in a race. average speed instantaneous speed Use a dictionary to define position with its scientific meaning. position 18

3 Student Edition, pp Reading Essentials, pp Draw a winding path that covers a distance of 70 miles and finishes with a displacement 20 miles southwest of the starting point. Label your diagram with the distance and direction traveled. Motion and Position Change in Position Speed Analyze the formula for speed by looking at the diagram and filling in the prompts. Put your finger over the s on the diagram. Now write the formula for speed. Put your finger over the d on the diagram. Write the calculation to find distance when you know speed and time. Prove to yourself that these formulas are correct by checking the units. speed (units of km _ h or m _ s distance (units of or ) ) = time (units of or ) d s t distance (units of ) 5 speed (units of ) 3 time (units of ) Note that the units always turn out the same on both sides of the equation. 19

4 Student Edition, pp Reading Essentials, pp GET IT? Identify two examples of motion in which an object s instantaneous speed changes. Graphing Motion Create a graph to show the progress of a runner who runs a 1-kilometer race in 3 minutes. The runner gets off to a fast start, runs the middle of the race at a more moderate pace, and then sprints to the finish. Graphing Checklist: title scale on x-axis units on x-axis label on x-axis scale on y-axis units on y-axis label on y-axis ANALYZE IT Analyze the following statement. A boat traveled at 10 km/h for one hour, then at 13 km/h for two hours, and finally at 11 km/h for another hour. The average speed over the whole trip was 15 km/h. Support your analysis with a calculation. 20

5 REVIEW IT! 5. MAINIDEA Describe the trip from your home to school using the words position, distance, displacement, and speed. 6. Explain whether the size of an object s displacement could be greater than the distance the object travels. 7. Describe the motion represented by a horizontal line on a distance-time graph. 8. Describe the difference between average speed and constant speed. 9. Think Critically During a trip, can a car s instantaneous speed ever be greater than its average speed? Explain. 10. Calculate Speed Michiko walked a distance of 1.60 km in 30 min. Find her average speed in m/s. 11. Calculate Distance A car travels at a constant speed of 30.0 m/s for 0.80 h. Find the total distance traveled in km. 21

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