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Welcome to 2048

Welcome to 2048. 2048. Dr. Jeffrey B. Bindell bindell@physics.ucf.edu www.physics.ucf.edu/~bindell. Class Meets Monday, Wednesday, Friday 10:30-11:20 AM. Textbook Physics f or Engineers and Scientists Volume I (Mechanics) Serway & Jewitt Thompson – Brooks/Cole (2004). General Information.

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Welcome to 2048

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  1. Welcome to 2048 2048 Dr. Jeffrey B. Bindell bindell@physics.ucf.edu www.physics.ucf.edu/~bindell 2048 Ch. 1-2

  2. Class MeetsMonday, Wednesday, Friday10:30-11:20 AM 2048 Ch. 1-2

  3. TextbookPhysics for Engineers and ScientistsVolume I (Mechanics) Serway & JewittThompson – Brooks/Cole (2004) 2048 Ch. 1-2

  4. General Information Instructor: Dr. Jeffrey BindellSchedule M,W,F 10:30 AM to 11:20 AM Room 359Phone 407-823-4194E-mail: bindell@physics.ucf.eduWebsite: www.physics.ucf.edu/~bindell OFFICE HOURS: M,W,F 7:30-9:30 AM 11:30-12:30 (Pot Luck) MAP-417 2048 Ch. 1-2

  5. This is a HARD Course! Reminder 2048 Ch. 1-2

  6. Grades 2048 Ch. 1-2

  7. Homework It is important to notice that homework counts for 15% of your grade. Homeworks will be based on WebAssign. Although “extensions” will be available, valid reasons should be offered at the time or he request. There will be one or two assignments per chapter. Each assignment will contain between 5 and 12 problems (usually). You must complete the assignment before the due time or you must request an extension. You will need a reason. 2048 Ch. 1-2

  8. No Curve 2048 Ch. 1-2

  9. Approximate Exam Schedule 2048 Ch. 1-2

  10. TENTATIVE 2048 Ch. 1-2

  11. WebAssign • You need to purchase a WebAssign login either from the bookstore or from the WebAssign website (with credit card). • For your first contact with WebAssign, go to: http://www.webassign.net/info/support/access_codes.html • Follow the guides to purchase a registration or to Login. The left side of the page has a scroll down menu that should get you where you need to get. • Be sure to bookmark the final login screen because you will be using it quite a bit (I hope). • Your login ID is your PIN with (or possibly without) the leading “0” and without any letters from your first name. Your password has been set to “ihatephysics”. After a successful login, be sure to change your password to something else to protect the privacy of your account. 2048 Ch. 1-2

  12. ratemyprofessors.com Completely unforgiving. Unhelpful office hours from which you leave more confused and with more questions than you came with. Seems to have no time for students, will not listen to any excuse, reasonable or not. Do not be 1 minute late on quiz day. Family emergency, car trouble= unforgivable sin Very difficult. Not in a tough way, but in an unhelpful way. Does not go over problems and his office hours are not helpful at all. You leave just as confused. Does not go over tests.  2048 Ch. 1-2

  13. ratemyprofessors.com Waiting for grades to come in. Have no idea if I passes or failed. Tests are UNFAIR, GRADING IS UNFAIR. I didn't miss more than a day of class. This class is an experiment and I don't like being the guinea pig when my GPA is on the line. Something better give or EVERYONE in the class will fail.  This was a SCALE-UP Course 2048 Ch. 1-2

  14. ratemyprofessors.com this class sucks, but bindell makes it doable. He answers ?'s, speaks clearly, and is pretty funny too. Fair tests and decent curves for the final grade. Do your webassign and make yourself known, you will pass this class...  Very hard class.Tests consist of 1 homework problem and 2 unseen problems, one easy, one hard.If you go to office hours(if you can get him on a day he's there)he will usually give you extra points on tests that TA's graded unfairly. He also curves the grades a lot.I was looking at a C and made an A  2048 Ch. 1-2

  15. ratemyprofessors.com Tough class. Bindell is a funny guy and does a pretty good job teaching. Just make sure that you study and don't fall behind.  Physics II is hard, no doubting that. But Jeff is by far a VERY reasonable professor. Speaks clearly, reasonable weekly quizzes, very flexible with webassigns, and wants the class to do well. Here is something I learned the hard way: STUDY HARD FOR THE TESTS, IF YOU DO NOT, YOU WILL FAIL THEM. PERIOD.  It is men like this that keep UCF from being considered an elite public uninversity. The man is comepletely and utterly ingorant of how to convey a concept to another human being. He wont answer questions. His tests are not representative of the material. He will show you reviews such as this and refute them. Don't listen. Get out at all costs.  2048 Ch. 1-2

  16. The Facts … Spring ‘05 F includes people who forgot to withdraw and just stopped attending. 2048 Ch. 1-2

  17. What I learned: • Students don’t like lectures, especially PowerPoint. • Students don’t like WebAssign • Some problems too hard • Some problems are not coded correctly by WA. • Students don’t like tests unless they are easy. • They’re NOT! • Course is hard, why would tests be easy??? 2048 Ch. 1-2

  18. My gripes …. • Students study at the last minute. • Students have big holes in their math skills: • Interpreting Graphs. • Using Calculus. • Students come to my office expecting me to solve their homework problems. • I will always help … I will not give you the answers! • Work on the problems before you come for help. 2048 Ch. 1-2

  19. How to get an A. STUDY ! 2048 Ch. 1-2

  20. PHY2049 Mechanics • The physics of how classical objects move. • Terms • mass, distance, time • Force, torque • displacement, speed, acceleration • momentum, energy • angular analogs • Issues for many students • calculus, graphical interpretation 2048 Ch. 1-2

  21. Important Definitions • Length or Distance • How “far” something moves or travels. • Measured against some agreed upon standard. Length Standard .. The Gorf 1 2 3 4 1/8 = 4 1/8 Gorfs Unknown Length 2048 Ch. 1-2

  22. Systems of Units • SI Units …. Meters, Seconds, Newtons/Kilograms • English System ….. Feet/yards, seconds, pounds/poundals 2048 Ch. 1-2

  23. The yard • One postulate was that the yard was derived from the girth  of a person's waist, while another claim held that the measure was invented by Henry I of England  as being the distance between the tip of his nose and the end of his thumb. These are believed to be more likely standardizing events as opposed to an actual coining of the measure. 2048 Ch. 1-2

  24. The real standard: The Meter More better .. 2048 Ch. 1-2

  25. More Important Definitions • TIME • The subjective “distance” between two EVENTS. • It needs to be objective … ie measurable and reproducible. • Original Clock – The Earth’s Rotation • “It is two days journey” • Today’s Clocks – • “He ran the race in 4 hours, 2 minutes and 21.85 seconds” 2048 Ch. 1-2

  26. DEFINITION – The Second of Time Unit of time (second) The unit of time, the second, was defined originally as the fraction 1/86 400 of the mean solar day. The exact definition of "mean solar day" was left to astronomical theories. However, measurement showed that irregularities in the rotation of the Earth could not be taken into account by the theory and have the effect that this definition does not allow the required accuracy to be achieved. In order to define the unit of time more precisely, the 11th CGPM (1960) adopted a definition given by the International Astronomical Union which was based on the tropical year. Experimental work had, however, already shown that an atomic standard of time-interval, based on a transition between two energy levels of an atom or a molecule, could be realized and reproduced much more precisely. Considering that a very precise definition of the unit of time is indispensable for the International System, the 13th CGPM (1967) decided to replace the definition of the second by the following (affirmed by the CIPM in 1997 that this definition refers to a cesium atom in its ground state at a temperature of 0 K): The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom. 2048 Ch. 1-2

  27. What should you remember from the previous slide? • The second used to be defined as some fraction of the length of the average day. • The second is now defined as the time it takes for some mysterious atomic process to occur. • This is something that can be measured in the laboratory. • This serves as a STANDARD for time. 2048 Ch. 1-2

  28. Sun Clock 2048 Ch. 1-2

  29. Water Clocks 2048 Ch. 1-2

  30. Pendulum Clocks We will study how a pendulum works later in the semester. 2048 Ch. 1-2

  31. Cuckoo Clock Cuckoo’s are not covered in this class. 2048 Ch. 1-2

  32. And so on … Rolex (~$10K) Atomic Clock (NASA) $ megabucks 2048 Ch. 1-2

  33. Mass The Standard Kilogram A “quantity of matter”. Locked up in Paris. We have copy 2048 Ch. 1-2

  34. Prefixes 2048 Ch. 1-2

  35. Unit Conversion-How many seconds old are you? • Assume you are exactly 21 years old and just qualified for your first legal drink. • The Trick: • Keep multiplying by one! 2048 Ch. 1-2

  36. Example 2048 Ch. 1-2

  37. So … =21 x 365 x 24 x 60 x 60 sec = 662,256,000 sec = 6.62 x 108 seconds 2048 Ch. 1-2

  38. 2048 Ch. 1-2

  39. First WA Assignment is on board • To think about • SI Units • Unit Conversion • Significant Figures • Dimensional Analysis • We will do this throughout the semester. All discussed in Chapter 1 of the textbook. 2048 Ch. 1-2

  40. Going around in circles …  s=pathlength A x A  B x=displacement B t=time interval (A,B) = 10 seconds Seconds 2048 Ch. 1-2

  41. s A x  B DEFINITIONS • s=path length or total distance trraveled. • x=displacement = NET distance traveled. Difference between final and initial position independent of the path. • t=time of the trip. Usually measured in seconds. 2048 Ch. 1-2

  42. More Definitions • average speed = distance traveled (s) / time taken [meters/sec.] • average velocity= displacement/time [m/s] • Note: the actual SYMBOL used for distance and displacement will usually change with the context of the problem. 2048 Ch. 1-2

  43. 2048 Ch. 1-2

  44. -40m 10s 2048 Ch. 1-2

  45. In the limit - Dx Dt In the limit of Dt0, velocity is the slope of the tangent to the x-t curve! 2048 Ch. 1-2

  46. Example The position versus time for a certain particle moving along the x axis is shown in Figure P2.3. Find the average velocity in the time intervals (a) 0 to 2 s, (b) 0 to 4 s, (c) 2 s to 4 s, (d) 4 s to 7 s, (e) 0 to 8 s. 2048 Ch. 1-2

  47. A position-time graph for a particle moving along the x axis is shown in Figure P2.7. (a) Find the average velocity in the time interval t = 1.50 s to t = 4.00 s. (b) Determine the instantaneous velocity at t = 2.00 s by measuring the slope of the tangent line shown in the graph. (c) At what value of t is the velocity zero? 2048 Ch. 1-2

  48. 2048 Ch. 1-2

  49. For v=constant 2048 Ch. 1-2

  50. Constant Velocity v x=0 xi xf xf – xi= distance traveled = v t MOTION DOESN’T ALWAYS START AT THE ORIGIN 2048 Ch. 1-2

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