1. PhysicsDisplacement and Velocity 08/25/2012

2. Learning ModulesO We will be using learning modules andother activities to gain the knowledgenecessary to master physics.O Please have your notebook and textbookavailable to complete requested tasks. 3. Focus TopicsO How is displacement different from distance?O What is One-Dimensional Motion?O Identify the difference between scalar andvector quantities.O How is velocity different from speed?O What is Average Velocity and how is itcalculated?O How to represent and interpret velocitygraphically? Identification of InstantaneousVelocity. 4. Continuous AssignmentO Throughout this chapter keep a journal (inyour folder) that collects each formuladiscussed.Example:Displacement:x= xf - xi Displacement= change inposition= final position-initial position 5. Scalar QuantitiesO Scalar is quantities (amounts) that arefully described by a magnitude (ornumerical value) alone.Magnitude= The size of an object; nodirectionA has a greater magnitude than B 6. Examples of ScalarO 68 degrees FahrenheitO $37.50O 35 mphO 7000 ftGraphical representations will be discussedlater. 7. Vector QuantitiesO A Vector is something that has two and only two defining characteristics:1. Magnitude : the meaning of magnitudeis size or quantity2. Direction: the meaning of direction is quite self-explanatory. It simply means that the vector is directed from one place to another. 8. Examples of VectorO 35 mph EASTO 7000 feet NORTHO 20 miles NORTHEASTGraphical representations of these will bediscussed later. 9. Self-AssessmentO In your notebook, come up with 4 exampleeach of scalar and vector quantities.4 vector examples4 scalar examples 10. ActivWordsFor the blanks on the left side. Place a by theword you know and a X by the word you do notknow. __ One Dimensional Motion __ __ Distance __ __ Displacement ____ Velocity __ __ Speed __ __ Slope ____ Instantaneous Velocity___ 11. One Dimensional Motion 12. Another Example 13. DistanceO Distance is the magnitude between twointerval points. (Scalar Quantity)Distance= Sum of total movementChris walked 200 yards to Cherrys house. Heleft Cherrys house and walked 50 yards to thestore. After leaving the store he walked to samepath home.What was the total distance traveled by Chris? 14. DisplacementDisplacement= the change in position of anobject. (Vector Quantity)x = xf xiChris walked 200 yards to Cherrys house. Heleft Cherrys house and walked 50 yards to thestore. After leaving the store he walked to samepath home.What was Chris total displacement? 15. PromptO Explain the difference between distance and displacement. Provide ExamplesO Explain the difference between scalar and vector. Provide Examples.Answer in complete sentences. 16. Complete this problem.Steven wakes up every morning to run. Heruns up the street 12 blocks (north). Heturns around runs 8 blocks (south) to a localstore to pick up his morning sausage andbiscuit. While he eats, calculate hisdisplacement and distance up to the store.*Remember which one is scalar and whichone is vector. 17. Positive and Negative Displacement 18. Positive Displacement 19. Negative Displacement 20. Wait I thought displacementwas a vector quantity!Correct. Although a sign is sufficient whendirections are not given.For example: -4 meters is a vectorrepresentation 21. ExampleIs this positive or negative displacement? 22. PromptO Explain the circumstances surrounding a positive or negative displacement. 23. ResearchO Look up the difference between speed and velocity? 24. SpeedO Speed is the amount of distance covered over a certain period of time. (Scalar)Speed = distance time 25. VelocityO Velocity is the rate at which an object changes(displacement) position over a period of time.(Vector)Velocity= displacement ortimeAverage Velocity = x =xf-xi ttf-ti 26. ExampleVelocity= 2 ft/sec east 27. Lets look at an example problemTrey runs the 400 m race in 49.45 seconds.What was his average velocity?Vavg = Displacement Time(400-0) = +8.1 m/s(49.45-0) 28. Lets look at another exampleO Laquishas average velocity as she droveto the store was 12 miles per hour (Lots oftraffic). It took her 20 minutes to reach thestore. How much distance did she travel.20 min. X 1 hour= 20/60= 0.33 hours 60 min.12 mph= Displacement = 3.96 miles 0.33 hours 29. Page 44O Complete problems on page 44: Practice 2A 30. PromptO Explain the difference between speed andvelocity. Provide examplesO I did not provide a definition for averagevelocity. Just by examining the formula,provide a good definition. 31. ActivGroupingO What are three words that come to mind when you think of slope.Write this in your notebook and email themto me.tsande13@gmail.com 32. O Create a line graph to represent the datagiven.Time (x) Position (y) 00 13 26 39 44 57 6 10 33. What can this graph tell us? 34. Chart ExerciseO Using the chart complete the following:Example: What is the slope between 0-3seconds?Slope= yf-yi = 9-0= 9/3 or 3xf-xi 3-02) 2-4 seconds3) 3-64) 0-6 35. Guess what?O You have actually found multiple averagevelocities.O So, for your example the average velocitywas +3 m/s 36. What else can this graph tell us? 37. Chart exerciseThis time find slope at individual points.Example: 3 secondsSlope= y/x9/3 or3 m/s1) 22) 43) 54) 0 38. Instantaneous VelocityO You just calculated instantaneous velocity.The example given illustrates that at 3seconds the instant velocity was +3 m/sWhat is going on between 3 & 4?What would it mean if the line between twotime periods looked liked this 39. Section wrap-upO Go back to slide 10 and complete rightside of the assessment now that we haveworked with the terms.O Complete lab (see materials inblackboard) at home or in classO Graphing Assessment