HTWClass2F07

HTWClass2F07 - Physics 100 How Things Work Instructor:...

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Unformatted text preview: Physics 100 How Things Work Instructor: Frank Tsui Office: 160 Phillips Phone: 919-962-0305 Email: [email protected] Office Hours: W 11-12 and 1-3, and by appt. Schedule: MWF at 8 AM, 215 Phillips Hall Text: How Things Work, the Physics of Everyday Life, by Louis A. Bloomfield (John Wiley, New York, 3rd Edition, 2006). Physics 100 Fall 2007 Course Website Blackboard: http://blackboard.unc.edu/ Class schedule showing assignments Pretests to read only! Pretests Test questions Grades posted Class presentations HW solutions External links If you have trouble with the Website, please email me or contact 962-HELP. Physics 100 Fall 2007 The Initial Schedule Monday Tuesday Wednesday 8/22 Pretest 1 posted Thursday Friday 8/24 HW 1 posted Monday 8/27 Pretest 1 due Pretest 2 posted Tuesday Wednesday 8/29 HW 1 due HW 2 posted Thursday Friday 8/31 Pretest 2 due Posted = Web + Class Physics 100 Fall 2007 Current Assignments Pretest 1 Has been posted. Due by next Mon. 8/27. Complete online in Blackboard under `Assignments' Homework 1: Due Next Wed. 8/29 in class. Chapter 1 Exercise 5, 13: , Problems 2, 3, 4: Fill in answer sheet only. See Appendix B for unit conversions. Homework + Pretest is worth 30% of grade! Physics 100 Fall 2007 Activities and Grading Scheme 1. Pretests 5 % Intended to get you to read the book before material is covered in class 2. Classroom participation using i-clickers 5 % Encouraging participation (the correctness of your answers will NOT contribute to the grade) 3. Homework and Home Experiments 25 % Both due in class on dates assigned in the Course Schedule; 10 % off until 5 PM; not accepted after 5 PM. 4. Hour Exams 40 % best 2 out of 3. NO make-up exams 5. Final Exam 25 % Physics 100 Fall 2007 Plan for the Next Two Weeks 8/22 8/29 Skating throwing bananas Falling balls throwing footballs Ramps breaking eggs Seesaws Levers, balances Wheels brakes, spinning v, a, Inertia Force, Newton's Laws 1&2 Gravity, weight, trajectories 8/31 9/7 Newton's Law 3 Energy and Work Angular Motion Torque Friction, Conservation of Energy and Momentum 9/10 Physics 100 Fall 2007 Skating Section 1.1 Physics 100 Fall 2007 Observations about Skating When you're at rest on a level surface, without a push, you remain stationary. with a push, you start moving that direction. When you're moving on a level surface, without a push, you coast steady & straight. with a push, you change direction or speed. Physics 100 Fall 2007 4 Questions about Skating 1. If a skater is at rest, why does she stay at rest? 2. If a skater is moving, why does she continue moving? 3. Why does a skater need ice or wheels to skate? 4. How does a skater start or stop moving? Physics 100 Fall 2007 Question 1 If a skater is at rest, why does she stay at rest? i. What keeps the dishes in place on the table? ii. When I pull the tablecloth, what will happen? iii. Does the speed at which I pull matter? Physics 100 Fall 2007 Physics Concept Inertia (Part 1) A body at rest tends to remain at rest Physics 100 Fall 2007 Question 2 If a skater is moving, why does she continue moving? i. Can I slice a stationary banana in midair? ii. What happen to the banana parts afterwards? iii. Can I slice a moving banana in midair? iv. What happen to the banana parts afterwards? v. What keeps a moving banana moving? Physics 100 Fall 2007 Experiment Which path will the banana take after I let go of the string? A B C E Physics 100 Fall 2007 D Physics Concept Inertia (Part 2) A body at rest tends to remain at rest A body in motion tends to remain in motion Physics 100 Fall 2007 Newton's First Law (Version 1) An object that is free of external influences moves in a straight line and covers equal distances in equal times. Physics 100 Fall 2007 Physical Quantities Position an object's location Velocity its change in position with time Physics 100 Fall 2007 Motion at Constant Speed in a Line Early time t1 Position x1 Later time t2 Position x2 Change in position x1 Velocity = Change in position Change in time x x2 Physics 100 Fall 2007 x v= t Newton's First Law An object that is not subject to any outside forces moves at a constant velocity. Physics 100 Fall 2007 Question 3 Why does a skater need ice or wheels to skate? Why does a hovercraft need an air cushion? Why did I cut the banana instantly after letting it go? Physics 100 Fall 2007 ...
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This note was uploaded on 03/26/2008 for the course PHYS 100 taught by Professor Tsui during the Fall '07 term at UNC.

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