1. Grade 10 Science Motion Unit

2. Significant Digits The correct way to record measurements is: The correct way to record measurements is: Record all those digits that are certain plus one and no more Record all those digits that are certain plus one and no more These “certain digits plus one” are called significant digits These “certain digits plus one” are called significant digits ALL DIGITS INCLUDED IN A STATED VALUE (EXCEPT LEADING ZEROES) ARE SIGNIFCANT DIGITS ALL DIGITS INCLUDED IN A STATED VALUE (EXCEPT LEADING ZEROES) ARE SIGNIFCANT DIGITS Measurements

3. Examples Table 1 Certainty of Measurements MeasurementCertainty (#of Significant Digits) 307.0 cm 4 61 m/s 2 0.03 m 1 0.5060 km 4 3.00 x 10 8 m/s 3

4. Decimal Present Decimal Absent 0.1240 2005 0.003450 2500 2340.00 A Red Arrow pops the 0’s like balloons until it sticks in a digit between 1 and 9. Then you count the rest of the digits that are left.

5. Counted and Exact Values When you count the number of something (example – students in the class), this is an exact value and has an infinite number of significant digits. When you count the number of something (example – students in the class), this is an exact value and has an infinite number of significant digits. When you use a defined value such as 100 cm/m or 60 s/min, you also have an infinite number of significant digits. When you use a defined value such as 100 cm/m or 60 s/min, you also have an infinite number of significant digits. Note the calculation rules on BLM 9.2B Note the calculation rules on BLM 9.2B

6. Converting Units When you want to change units we use a conversion factor (or equality) When you want to change units we use a conversion factor (or equality) Some Equalities 100cm/m 1000m/km 60 s/min 60 min/h

7. Assignment : Significant Digits BLM 9.2a, 9.2b Complete the Significant Digits Worksheet See answer key Complete the Significant Digits Worksheet See answer key answer key answer key Questions 1-6, 9 pg 349 in your text Questions 1-6, 9 pg 349 in your text

8. Relating Speed to Distance and Time Average Speed V av is: Average Speed V av is: The total distance divided by the total time for a trip The total distance divided by the total time for a trip V av = d V av = d t t See BLM 9.5a for examples See BLM 9.5a for examples Instantaneous speed – the speed an object is travelling at a particular instant. Ie. Radar trap Instantaneous speed – the speed an object is travelling at a particular instant. Ie. Radar trap Constant Speed (uniform motion) – if the instantaneous speed remains the same for a period of time. Ie. Cruise control on your car Constant Speed (uniform motion) – if the instantaneous speed remains the same for a period of time. Ie. Cruise control on your car

9. A car travels 45 km at a speed of 90 km/h. How long did the trip take? What do you know in the Question What do you know in the Question d= 45 km d= 45 km Vav = 90 km/h Vav = 90 km/h t = ? t = ?

10. Decide on a formula Decide on a formula t = d t = dVav t d Vav

11. Substitute the knowns into the formula and solve Substitute the knowns into the formula and solve t = 45 km t = 45 km 90 km/h t = 0.5 h Write a concluding statement: It takes 0.5 h for the car to travel 45 km at a speed of 90 km/h

12. Problem Solving Summary List the variables you know List the variables you know Decide on a formula Decide on a formula Substitute what you know into the formula Substitute what you know into the formula Solve and write a concluding statement Solve and write a concluding statement SpeedSpeed- Click Me

13. Assignment : Relating Speed to Distance and time BLM 9.5 a,b, d BLM 9.5 a,b, d Answer Key Answer Key Answer Key Answer Key Questions 1,2,3,6,7,8 pg 358 Answer Key Answer Key Answer Key Answer Key

14. Distance – Time Graphs Independent variable - X axis is always time Independent variable - X axis is always time Dependent Variable - Y axis is always distance Dependent Variable - Y axis is always distance Speed is determined from the slope of the best fit strait line of a distance – time graph Speed is determined from the slope of the best fit strait line of a distance – time graph SmartBoard Slope of a Line SmartBoard Slope of a Line SmartBoard

15. See BLM 9.7a In the following diagram: a = constant speed b = not moving c = accelerating

16. Assignment : Distance – Time Graphs Lab 9.5 Graphing Distances During Acceleration Questions 3,4,5,6 pg 365 Questions 3,4,5,6 pg 365 Answer Key Answer Key Answer Key Answer Key Activity 9.9 Simulation : Average Speed on an Air Table Activity 9.9 Simulation : Average Speed on an Air Table BLM 9.9a BLM 9.9a Worksheet – Determining Speed from a d/t Graph Worksheet – Determining Speed from a d/t Graph Q 1-6 Q 1-6 Answer Key Answer Key Answer Key Answer Key Lab9.6 Balloon Cars Lab Lab9.6 Balloon Cars Lab Lab 9.10 Determining an Average Speed Lab 9.10 Determining an Average Speed Review Questions 1,3,4,7,9,11 pg 376 Review Questions 1,3,4,7,9,11 pg 376 Answer Key Test Chapter 9 Test Chapter 9

17. Introduction to Vectors Reference Point – origin or starting point of a journey. Ie. “YOU ARE HERE” on a mall map Reference Point – origin or starting point of a journey. Ie. “YOU ARE HERE” on a mall map Position – separation and direction from a reference point. ie. “150 m [N] of “YOU ARE HERE” Position – separation and direction from a reference point. ie. “150 m [N] of “YOU ARE HERE” Vector Quantity – includes a direction such as position. A vector quantity has both size and direction ie. 150m [N] of Sport Chek Vector Quantity – includes a direction such as position. A vector quantity has both size and direction ie. 150m [N] of Sport Chek Scalar quantity – includes size but no direction. ie. 150 m away from Sport Chek Scalar quantity – includes size but no direction. ie. 150 m away from Sport Chek

18. Find Your Friend – You receive a text from a close friend asking for a money loan, that they desperately need. Your task is to find your friend in the Uptown Mall (Map Scale is 1mm = 10m) Map Scale Map Scale Enter the mall at the Silver Entrance and walk to the * You Are Here Map at K7 Use Vectors (arrows drawn to scale on a map) to show your journey – be very accurate in your line length!!! Enter the mall at the Silver Entrance and walk to the * You Are Here Map at K7 Use Vectors (arrows drawn to scale on a map) to show your journey – be very accurate in your line length!!! Walk 300 m [SE] Walk 300 m [SE] Walk 850 m [NE] Walk 850 m [NE] Walk 500 m [SE] Walk 500 m [SE] Walk 356m [E] Walk 356m [E] Where is your Friend? Use a Position and Reference Point Where is your Friend? Use a Position and Reference Point Where is the nearest Exit? Describe it as both a vector and a scalar quantity Where is the nearest Exit? Describe it as both a vector and a scalar quantity Could your friend have got his money any other way? Could your friend have got his money any other way?

19. Chapter 11 Displacement and Velocity

20. Quantity SymbolSymbolExample Scalar Quantity Distance d 292 m Time t 3.0 h Vector quantity Position d 200 m [E] (from Michael’s) Displacement d 30 m [S] of *You Are Here

21. Displacement Displacement – a change in position. See BLM 11.1a – a change in position. See BLM 11.1a Symbol Format Symbol Format – used when communicating a vector. See BLM 11.1b – used when communicating a vector. See BLM 11.1b Drawing Vectors – Drawing Vectors – Draw a compass rose (N,E,S,W) Draw a compass rose (N,E,S,W) and the scale i.e. 1 cm = 10m and the scale i.e. 1 cm = 10m Draw the arrow to the stated scale or write the size of the vector next to the line Draw the arrow to the stated scale or write the size of the vector next to the line The direction of the arrow represents the direction of the vector and the length of the line represents the size of the vector The direction of the arrow represents the direction of the vector and the length of the line represents the size of the vector 20 m

22. Assignment : Introduction to Vectors Questions 1,5,6,7,8 pg 417 Questions 1,5,6,7,8 pg 417 Walk the Graph Activity pg 418 & BLM 11.2 Walk the Graph Activity pg 418 & BLM 11.2

23. Vector Diagrams – Join each vector by connecting the “head” end of one vector to the “tail end of the next vector. Vector Diagrams – Join each vector by connecting the “head” end of one vector to the “tail end of the next vector. Find the resultant vector by drawing an arrow from the tail of the first vector to the head of the last vector Find the resultant vector by drawing an arrow from the tail of the first vector to the head of the last vector Vector Diagrams – Join each vector by connecting the “head” end of one vector to the “tail end of the next vector. Vector Diagrams – Join each vector by connecting the “head” end of one vector to the “tail end of the next vector. Find the resultant vector by drawing an arrow from the tail of the first vector to the head of the last vector Find the resultant vector by drawing an arrow from the tail of the first vector to the head of the last vector Adding Vectors on a Straight Line

24. Resultant displacement - Resultant displacement - is a single displacement that has the same effect as all of the individual displacements combined. is a single displacement that has the same effect as all of the individual displacements combined. d R

25. Adding vectors can be done by one of the following methods using scale diagrams using scale diagrams adding vectors algebraically adding vectors algebraically combined method combined method See BLM 11.3 See BLM 11.3

26. 11.3 Adding Vectors Along a Straight Line Two vectors can be added together to determine the result (or resultant displacement). Use the “head to tail” rule Join each vector by connecting the “head” and of a vector to the “tail” end of the next vector

27. d1d1 d2d2 dRdR Resultant vector

28. Leah takes her dog, Zak, for a walk. They walk 250 m [W] and then back 215 m [E] before stopping to talk to a neighbor. Draw a vector diagram to find their resultant displacement at this point. Scale Diagram Method

29. 1)State the direction (e.g. with a compass symbol) 2)List the givens and indicate the variable being solved 3)State the scale to be used 4)Draw one of the initial vectors to scale d1 = 250m [W], d2 = 215m [E], dR = ? 1 cm = 50 m N

30. 5)Join the second and additional vectors head to tail and to scale 6)Draw and label the resultant vector 7)Measure the resultant vector and convert the length using your scale 8)Write a statement including both size and direction of the resultant vector dR 0.70 cm x 50m / 1 cm = 35m [W]

31. The resultant displacement for Leah and Zak Is 35 m [W].

32. Adding Vectors Algebraically This time Leah’s brother, Aubrey, takes Zak for a walk They leave home and walk 250 m [W] and then back 175 m [E] before stopping to talk to a friend. What is the resultant displacement at this position.

33. Adding Vectors Algebraically When you add vectors, assign + or – direction to the value of the quantity. (+) will be the initial direction (-) will be the reverse direction 1.Indicate which direction is + or – 2.List the givens and indicate which variable is being solved 250 m [W] will be positive d 1 = 250 m [W], d 2 = 175 m [E], d R = ?

34. 3.Write the equation for adding vectors 4.Substitute numbers (with correct signs) into the equation and solve 5.Write a statement with your answer ( include size and direction) d 1 +d2d2 d R = d R = (+ 250 m) + (-175 m) d R = + 75 m or 75 m[W] The resultant displacement for Aubrey and Zak is 75 m [W]

35. Combined Method Zak decides to take himself for a walk. He heads 30 m [W] stops, then goes a farther 50 m [W] before returning 60 m[E]. What is Zak’s resultant displacement?

36. Combined Method 1)State which direction is positive and which is negative 2)Sketch a labeled vector diagram – not to scale but using relative sizes West is positive, East is negative 30m 50m 60mdRdR

37. 3)Write the equation for adding the vectors 4)Substitute numbers( with correct signs) into the equation and solve 5)Write a statement with your answer (including size and direction) d R = d 1 +d 2 +d 3 dR = (+ 30 m) + (+50m) + (-60m) dR = + 20m or 20m [W] The resultant displacement for Zack is 20 m [W]

38. Assignment : Adding Vectors in a Straight Line Questions 1-3,5-7 pg 423 Answer Key Questions 1-3,5-7 pg 423 Answer KeyAnswer KeyAnswer Key Activity “Bug Race” Activity “Bug Race”

39. Adding Vectors at an Angle If we know the path an object takes we can draw an accurate to scale vector diagram of the journey. We can then determine the following; If we know the path an object takes we can draw an accurate to scale vector diagram of the journey. We can then determine the following; compare the final position to the reference point compare the final position to the reference point determine the resultant displacement determine the resultant displacement Certain rules must be followed add vectors at an angle. See BLM 11.5a Certain rules must be followed add vectors at an angle. See BLM 11.5a

40. Adding Vectors at an Angle d 1 = 3 cm d 2 = 4 cm d R = 5cm Scale 1 cm = 5 Km dR = 5 cm x 5 Km/1cm dR = 25 Km [SE] N

41. Assignment : Adding Vectors at an Angle BLM 11.5b BLM 11.5b Activity “Hide a Penny Treasure Hunt” Activity “Hide a Penny Treasure Hunt”

42. Velocity Velocity – v Velocity – v a vector quantity that includes a direction and a speed ie. 100 km/h [E] a vector quantity that includes a direction and a speed ie. 100 km/h [E] Constant Velocity – means that both the size (speed) and direction stay the same Constant Velocity – means that both the size (speed) and direction stay the same

43. Average Velocity – v av Average Velocity – v av is the overall change of position from the start to finish. It is calculated by dividing the resultant displacement (which is the change of position) by the total time is the overall change of position from the start to finish. It is calculated by dividing the resultant displacement (which is the change of position) by the total time V av = d R V av = d R t See BLM 11.7a,b See BLM 11.7a,b

44. Assignment : Velocity BLM 11.7c BLM 11.7c Questions 3,5,7, pg 436 Questions 3,5,7, pg 436 Activity Tracking and Position pg 438 & BLM 11.9 Activity Tracking and Position pg 438 & BLM 11.9 Review Questions 4,8,9,10 pg 442 Review Questions 4,8,9,10 pg 442 Test Chapter 11 Test Chapter 11

45. Chapter 12 Displacement, Velocity, and Acceleration

46. Position – Time Graphs Position and displacement are vectors and include direction. It is possible to represent vector motion on a graph. Very much like a distance – time graph. Can you see the differences? Position and displacement are vectors and include direction. It is possible to represent vector motion on a graph. Very much like a distance – time graph. Can you see the differences?

47. Can you see the differences?

48. The slope of a position-time graph is equal to the velocity of the motion The slope of a position-time graph is equal to the velocity of the motion The slope of the tangent at a point on a position- time graph yields the instantaneous velocity. The slope of the tangent at a point on a position- time graph yields the instantaneous velocity. Instantaneous velocity is the change of position over an extremely short period of time. Instantaneous velocity is like instantaneous speed plus a direction Instantaneous velocity is the change of position over an extremely short period of time. Instantaneous velocity is like instantaneous speed plus a direction

49. Assignment : Position-Time Graphs Activity : Describing Position-Time Graphs “Walk the Dog” Activity : The Helicopter Challenge Exercise : BLM 12.1 a,b,c

50. Velocity Time Graphs

51. A velocity – time graph can show travel in opposite directions over a period of time. A velocity – time graph can show travel in opposite directions over a period of time. The slope of the line on a velocity –time graph indicates the acceleration of an object The slope of the line on a velocity –time graph indicates the acceleration of an object

52. Acceleration – a Acceleration – a is calculated by dividing the change in velocity by the time. Because there is a direction associated with the velocity, the acceleration is also a vector quantity. is calculated by dividing the change in velocity by the time. Because there is a direction associated with the velocity, the acceleration is also a vector quantity. Constant acceleration is uniformly changing velocity. Constant acceleration is uniformly changing velocity.

53. Formula a = v t

54. V av = d R Average Velocity of an object in motion can be determined from the ratio of total distance divided by total elapsed time. Average Velocity of an object in motion can be determined from the ratio of total distance divided by total elapsed time. t See BLM 12.2 a,b

55. Assignment : Velocity – Time Graphs BLM 12.2 c BLM 12.2 c

56. Acceleration and Displacement Acceleration is the change of velocity over time Acceleration is the change of velocity over time Questions 5,7,8 pg 465 Questions 5,7,8 pg 465 Test Chapter 12 Test Chapter 12