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Monday, January 27 th

Monday, January 27 th. You should be starting your new notebook Entry Task List 3 expectations of Mrs. Krogh’s that you think are important. Schedule: Review Expectations Motion vocabulary. Homework: Vocabulary complete Read 10.1. Objective:

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Monday, January 27 th

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  1. Monday, January 27th You should be starting your new notebook Entry Task List 3 expectations of Mrs. Krogh’s that you think are important. Schedule: • Review Expectations • Motion vocabulary Homework: • Vocabulary complete • Read 10.1 • Objective: • I can understand an introduction to basic information about motion.

  2. Tuesday, January 28th Entry Task Describe WHERE Safeway is. Schedule: • Objects in motion notes and activity Homework • 10.1 RSG Please have on desk: • Chapter 10 Vocabulary • Objective: • I can describe an object’s position and motion with respect to a reference point

  3. Possible Answer Your description of where Safeway will depend on what you use as a reference point. For instance: • Safeway is 1 mile away from here. • Safeway is across from Jack in the Box. • Safeway is on the corner of Bridgeport and 40th. Reference Points help to describe where something is and/or how to get there

  4. 10.1 Notes-An object in motion changes position • Position – (of a place or object) is the location of that place or object • You can describe where something is by comparing it’s position with where you currently are. • Compare the position of something in the room with where you are sitting. Write this in your journal.

  5. How do you describe a position? • Reference Point- a location to which you compare other locations. • You can describe the position of your house by using the school as a reference point • Ms. Guttormsen’s house is 23.8 miles northwest of Curtis Junior High • Describe your position in the classroom using the door as a reference point. Write this in your journal.

  6. Measuring Distance • The way you measure distance depends on what you want from the information. • Sometimes you need to know the straight-line distance between two positions • Sometimes you need to know the total length of a certain path between two positions. • Units • Meter • Metric System Step Ladder

  7. Motion is a Change in Position • Motion- the change of position over time. • Give an example of some things that you have seen that have motion. • Describe a motion that you are witnessing right now

  8. Describing Motion • When you described something that you witnessed that had motion, did you describe the following things? • Speed of the object • How quickly or slowly (often) the object changes position?

  9. Relative Motion • Have you ever sat in a parked car and had the car next to you back up or go forward? Did you feel like it was your car that was moving? • How an observer sees a motion depends on how it compares with his own motion. • Frame of reference-location of an observer • As I walk past you. Am I moving position or are you? Think about different frames of reference.

  10. Wednesday,January 29th Entry Task Suppose you pass a table on which a ball is sitting near the end of a cardboard tube. After a few minutes, you pass the table again. That ball is now near the other end of the tube. 1. What can you say about the motion of the ball between those two times? 2. What can’t you say about the motion? USE FULL SENTENCES, IQIA Schedule: • 10.1 QUIZ • Speed notes • Speed math Homework: • Speedy Math handouts Objective: I can explain that speed measures how fast position changes • Please Have on Desk: • 10.1 RSG

  11. “How Fast Can You Go?” Understanding and Calculating Speed

  12. It Starts with Position... • Position is the location of a place or an object. • Motion is the change in position of an object over time.

  13. Measuring Motion and Time • Motion: Is measured as the distance an object travels between a beginning and an ending point. • Time: Is measured as the time needed for an object to travel between a beginning and an ending point.

  14. Measuring Motion and Time • Units: • Distance: m or km for longer distances; cm for shorter distances. • Time: seconds usually although it can also be hours.

  15. What is Speed? • Speed is a measure of how fast something moves. • Speed is a measure of how far something moves in a given time. • The greater the speed an object has, the faster it changes position AND the farther it moves in a unit of time.

  16. Calculating Speed • To calculate speed, you need to know both distance and time measurements. • Speed = distance S = d/t time • The standard metric unit for speed is m/s, but are also given in km/hr.

  17. Speed Calculation Example • A wheelchair racer completes a 100-meter course in 20 seconds. What is his speed? • What do you know? distance = 100 m time = 20 s • What do you want? speed • Use the formula: S = 100 m = 5 m 20 s s

  18. Speed Calculations: Your Turn! • A woman runs 200 m in 25 s. What is her speed? • If you travel 100 m in 50 s, what is your speed?

  19. Speed Calculations: Part 2 Sometimes you are given Speed and you have to determine either a missing distance or time: what do you do? Time is the unknown: Distance/Speed Distance is the unknown: Time x Speed

  20. Distance-Time Graphs • One way to show the motion of an object is by using a graph that plots the distance the object has traveled against time. • This kind of graph shows how speed relates to distance and time.

  21. How to Graph Speed • Give your graph a TITLE. • Time is on the x-axis (horizontal). Be sure to scale properly and include your units! • Distance is on the y-axis (vertical). Be sure to scale properly and include your units! • The steepness (slope) of the line indicates the speed of the object!

  22. A Minute in the Life of a Zebra Distance (meters) Time (seconds)

  23. In your journal, • CYR, page 320 • RV, page 321 • CYR, page 322 • Practice the math, page 324 • CYR, page 326 • Review, #1-6, page 327

  24. Thursday,January 30th Entry Task • Explain why velocity is a vector Schedule: • Calculate Speed Activity (exit ticket) Homework: • Read/RSG 10.2 Objective: I can measure and calculate the speed of a moving object. • Please Have on Desk: • Speedy Math handouts

  25. Friday, January 31st Entry Task Use a Venn diagram to compare and contrast speed and velocity. Schedule: • Acceleration notes Homework: • 10.3 RSG Please have on desk: • 10.2 RSG Objective: I can understand that acceleration measures how fast velocity changes

  26. Acceleration Notes

  27. What is Acceleration? • The rate at which velocity changes is called ACCELERATION. • Acceleration measures how quickly velocity is changing.

  28. Acceleration is not just “speeding up” • We usually think of speeding up as acceleration, but ANY change in speed is considered acceleration.

  29. Acceleration in the same direction as motion • When the acceleration occurs in the same direction as the object is moving, the speed of the object increases.

  30. Acceleration in the opposite direction as motion • When the acceleration occurs in the opposite direction as the object is moving, the speed of the object decreases.

  31. Acceleration is also changing direction! • When an object is moving at a constant speed, but changes direction, that is acceleration too.

  32. Circular motion is special! • Circular motion is a special kind of acceleration. It is known as centripetal acceleration. • Centripetal comes from the root words that mean “center-seeking.”

  33. We calculate acceleration with this equation: Acceleration = final velocity – starting velocity time it takes to change velocity or: a = v2 – v1 v2 = final velocity t v1 = starting velocity t = time Acceleration is expressed in units of speed/time such as m/s2 How do you find acceleration?

  34. How to graph acceleration • Give your graph a title! • Time goes on the x-axis. Be sure to: - scale the time appropriately - label the axis - show the units (no naked numbers!)

  35. How to graph acceleration 3. Speed goes on the y-axis. Be sure to: - scale the speed appropriately - label the axis - show the units (no naked numbers!) 4. The slope of the line is the acceleration

  36. The slope is acceleration? • If the slope is positive, the object is speeding up. • If the slope is negative, the object is slowing down. • If the line is flat, the object is moving at a steady speed (no acceleration = zero slope)

  37. You try it! 1. Sheryl is walking 0.5 m/s and accelerates to 0.6 m/s in one second. What is her acceleration? 2. A bus traveling at 10 m/s slows down to a complete stop in 20 s. What is the acceleration of the bus?

  38. In your journal, Answer the following and IQIA!!! • CYR, page 329 • CYR, page 330 • CYR, page 333 • RV, page 334 • CYR, page 335 • Review questions #1-6, page 335

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