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the action or process of moving or being moved.

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Presentation on theme: "the action or process of moving or being moved."— Presentation transcript:

1 the action or process of moving or being moved.
Unit 3 Ch. 8- Motion mo·tion/ˈmōSH(ə)n/ Noun the action or process of moving or being moved.

2 In pairs: Describe the motion of this soccer ball before and after it is kicked

3 Motion Definitions Quantities that are measured or counted have a magnitude but may also contain a direction. Magnitude refers to the size of a measurement or the amount you are counting. Example: 100km/hr. Quantities that describe magnitude but do not include direction are called scalar quantities or scalars. Example: 25 seconds Quantities that describe magnitude and also include direction are called vector quantities or vectors. Example: 5 km north

4 Motion Definitions When you use maps, what kind of quantity are you using? Answer: Vectors

5 Motion Definitions Distance (d) is a scalar quantity that describes the length of a path between two points or locations. Example: A person ran a distance of 400 m. Position ( ) is a vector quantity that describes a specific point relative to a reference point. What is an example of position? Example: The school is 3.0 km east of my house. *What does SI unit stand for? What is an example of an SI unit

6 Time Interval and Position
Time (t) is a concept that describes when an event occurs. Initial time (ti) is when the event began. Final time (tf) is when the event finished. Time interval is the difference between the final and initial times. Time interval is calculated by: The time interval to move from the fire hydrant to the sign is calculated by: The position of the sign is 7 m east of the tree. See page 348 (c) McGraw Hill Ryerson 2007

7 Time Interval and Position
Who needs to stretch? I need 3 volunteers with cell phones! Time (t) is a concept that describes when an event occurs. Initial time (ti) is when the event began. Final time (tf) is when the event finished. Time interval is the difference between the final and initial times. Time interval is calculated by: The position of the sign is 7 m east of the tree. See page 348 (c) McGraw Hill Ryerson 2007

8 Time Interval and Position
Who needs to stretch? I need 3 volunteers with cell phones! Jog around the perimeter of the class or outside. person A with cell phone stands at start person B with cell phone stands at a given location Persons A & B take note of time as runner passes. Record on board What is Time interval between different points? The position of the sign is 7 m east of the tree. See page 348 (c) McGraw Hill Ryerson 2007

9 Motion Definitions Displacement describes the straight-line distance and direction from one point to another. Displacement describes how much an object’s position has changed. Displacement is equal to the final position minus the initial position. The SI unit for displacement is metres, m.

10 Motion Definitions What is the displacement of a runner who runs 1 lap on a track? Hint: Displacement describes how much an object’s position has changed.

11 2 friends: Scalar and Vector
Description Example Scalar Quantity  Describes Magnitude only A bag of gold lies 20m from here  Vector  Describes Magnitude AND direction  A bag of gold lies 20m North West of here Scalar’s directions= S Vector's directions= V

12 Learning Check: What is the quantity that describes the length of a path between two points or locations? Answer: Distance What is the quantity that describes a specific point relative to a reference point? Answer: Position

13 Learning Check What is the term used for the difference between the final and initial time? Answer: Time interval

14 Now that we know a little about motion, time, position; what other concept of motion are we missing? (hint: think vector) Direction!!

15 Watch for Signs Common sign conventions
When using vector quantities, opposite directions are given opposite signs. Common sign conventions See page 349 (c) McGraw Hill Ryerson 2007

16 Watch for Signs Common sign conventions
When using vector quantities, opposite directions are given opposite signs. Between 0 s and 15 s the person’s displacement is Common sign conventions = 10 m [W] – 5 m [E] = -10 m – 5 m = -15 m = 15 m [W] See page 349 (c) McGraw Hill Ryerson 2007

17 A graph What distance did the person walk in this same time interval?
0-15 sec

18 End of Lecture 1 In your own words, on a piece of paper, tell me the difference between displacement and distance. Work on pages 2-3 of your work book

19 Uniform Motion Objects in uniform motion travel equal displacements in equal time intervals. Objects in uniform motion do not speed up, slow down, or change direction. The position of the ball in this photo is shown at equal time intervals. How would you determine if this motion is uniform motion? See page 350

20 Graphing Uniform Motion
Motion of an object can be analyzed by drawing a position-time graph. A position-time graph plots position data on the vertical axis (y axis) and time data on the horizontal axis (x axis). See page 351

21 Graphing Uniform Motion
A best-fit line is a smooth curve or straight line that most closely fits the general shape outlined by the points. Uniform motion is represented by a straight line on a position-time graph. The straight line passes through all the plotted points. A straight line passing through the plotted data indicates uniform motion. See page 351

22 Graphing motion Is this Uniform or ununiformed motion?

23 Graphing motion Is this Uniform or ununiformed motion?

24 Graphing motion Is this Uniform or ununiformed motion?

25 Graphing motion Is this Uniform or ununiformed motion?
What is happening to this object as time increases?

26 Slope The slope of a graph refers to whether a line is horizontal or goes up or down at an angle. Positive slope Slants up to the right Indicates motion in the direction of the positive y axis Learning check: give me an example of on object that would have this type of graph/slope See pages

27 Slope Zero slope Horizontal line
Indicates that the object is stationary Learning check: give me an example of on object that would have this type of graph/slope See pages

28 Slope Negative slope Slants down to the right
Indicates motion in the direction of the negative y axis Learning check: give me an example of on object that would have this type of graph/slope See pages

29

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