Physics 211. Elementary Physics Fall Instructor: Dr. Geoffrey Lovelace Sections 1 & 70. Lecture 1 8/28/12. ! A. A little bit about me
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1 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 1 8/28/12 I. Introduction! A. A little bit about me! B. Syllabus! C. What is physics? II. Orders of magnitude! A. Powers of 10! B. Order of magnitude estimate! C. Length scales! D. Powers of 10 video! A. No homework today! B. Class participation: 1 thing you look forward to, 1 question/concern/dislike 1
2 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 2 8/30/12 I. Survey results! A. Looking forward to! B. Questions & concerns II. Measurement! A. Units & unit conversion! B. Uncertainty & significant figures! A. Homework #1 posted on Mastering Physics website (due Sept. 6, 11:59PM)! B. Next week: chapter 2 of Wilson, Buffa, & Lou! C. Class participation: math survey 2
3 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 3 9/4/12 I. Introduction to Kinematics = How Things Move! A. Scalars: Distance, average speed, instantaneous speed! B. Vectors: Displacement, average velocity, instantaneous velocity! C. Problem solving strategy & worked example: was I speeding?! D. Vector: average, instantaneous acceleration II. Plotting position, velocity and acceleration! A. Position vs. time! B. Velocity = slope of position vs. time! C. Acceleration = slope of velocity vs. time! D. Demo: motion sensor: student walking, running, basketball! A. Reminder: Homework #1 due Thursday, September 6 at 11:59PM! B. Next class: remainder of chapter 2: free fall, more motion! C. Class participation: position graph clicker question 3
4 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 4 9/6/12 I. Constant acceleration motion & freefall! A. Freefall demo: feather & penny drop ( department/lecture-demos/96)! B. Kinematic equations for constant acceleration! C. Worked example: Mario Kart! II. Math review: trig! A. sin, cos, tan, and SOH-CAH-TOA! B. Pythagorean theorem!! A. Reminder: Homework #1 due Thursday, September 6 at 11:59PM! B. Homework #2: assigned today, due in 1 week, September 13 at 11:59PM! C. Next week: more kinematics, start 2D motion (chapter 3)! D. Class participation: a trig identity 4
5 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 5 9/11/12 I. Trigonometry review! A. SOH-CAH-TOA! B. Pythagorean theorem & a trig identity II. More constant acceleration in 1D! A. Example: Ball toss! B. Group problem: stopping distance III. Intro to 2D motion! A. Geometric vector addition ( tip to tail )! B. 2D motion reduces to 2 independent 1D problems! C. Projectile demo: ball toss on a train ( department/lecture-demos/96) IV. Assignments! A. Reminder: homework #2 due Thursday at 11:59PM! B. Exam #1: in 2 weeks, covers chapters 1-3. (We are now going through Ch. 3.)! C. Class participation: ranking vector sums 5
6 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 6 9/13/12 I. Speed bus jump II. Vector components & addition by components! A. Components <===> magnitude, direction: the trig you will need! B. Addition by components! C. Worked example: vector addition III. Projectiles! A. When velocity, acceleration not parallel, motion is along a curve! B. Projectile: horizontal: uniform motion, vertical: freefall! C. Demo: monkey shoot IV. Assignments! A. Reminder: homework #2 due today at 11:59PM! B. Homework #3 assigned today: due in 1 week! C. Exam #1: 2 more classes remain before first exam! D. Class participation: opinion survey #2! E. Reading: to end of chapter 3 6
7 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 7 9/18/12 I. Survey results II. More projectiles! A. Demo: simultaneous fall! B. More examples: shot-put, archer fish! C. Features of projectile motion!! 1. Visualize position, velocity, acceleration!! 2. Hang time!! 3. Worked example: range vs. angle! A. Reminder: homework #3 due Thursday at 11:59PM! B. Exam #1: 1 more class remains before first exam! C. Class participation: Concept you are feeling most confident about, least confident about; do you like whiteboard or slides better for examples? 7
8 PHYS 211, Sections 01 (13159) & 70 (20685)! I. Relative velocity Lecture 8 9/20/12! A. Example: Star Wars bike chase showing different frames of reference! B. Calculating relative velocities: application of vector addition II. Introduction to the laws of motion! A. Force = vector = something capable of giving an object acceleration! B. Net force = vector sum of all forces acting on an object! C. Mass = resistance to acceleration! C. Newton s first law: if net force is zero, velocity constant & acceleration zero! D. Newton s second law: a=fnet/m! E. Example: projectile motion! A. Exam #1: Tuesday (next class period)! B. Homework #3: due 11:59PM tonight! C. Homework #4: assigned today! D. Class participation: make a wish for what you would like on the formula sheet E. Reading: continue chapter 4 8
9 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 9 9/27/12 I. Newton s first and second laws of motion: conceptual! A. Newton s first law (demo: air puck)! B. Normal force! C. Newton s second law (demo: inclined air track) II. Newton s third law of motion: conceptual! A. Forces come in pairs of equal magnitude and opposite direction! B. These forces act on different objects! C. Newton s third law (demo: push off the wall, WALL-E fire extinguisher video)! A. For next week: continue reading chapter 4, about free-body diagrams! B. Homework #4: due 11:59PM tonight! C. Homework #5: assigned today! D. Class participation: just your name (ran out of time to pose the planned question)! E. Midterm Exam #1 results 9
10 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 10 10/02/12 I. Summary & review: Newton s laws of motion II. Forces: weight & normal force, string tension! A. Weight & normal force: flat vs. inclined surface! B. String tension, pulleys III. Quantitative examples! A. Example 4.3: pulling blocks connected by a string! B. Example: Atwood s machine! C. Demo: Atwood s machine on a slope: funicular train up a mountain IV. Assignments! A. Homework #5 due: 11:59PM Thursday! B. Class participation: climbing the rope clicker question 10
11 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 11 10/04/12 I. More quantitative second-law problems! A. Free-body diagrams! B. Worked example: Atwood machine & ramp II. Friction! A. How friction works! B. Static & kinetic ( sliding ) friction! A. Homework #5: due today at 11:59PM! B. Homework #6: assigned today! C. Class participation: free-body diagram question! D. Reading: finish chapter 4, start chapter 5 11
12 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 12 10/09/12 I. Class participation Followup: free-body diagram II. Group problem: free-body diagram problem with friction (Ex from text) III. Homework followup! A. Kinematic equations apply for constant acceleration only! B. Newton s third law recap IV. Assignments! A. Homework #6: due Thursday at 11:59PM! B. Class participation: free-body diagram worksheet! C. Reading: chapter 5 12
13 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 13 10/11/12 I. Work & energy! A. Work with constant force! B. Variable force example: mass on a spring! C. Work-energy theorem II. Kinetic energy III. Introduction to conservation of energy! A. Demo: lightning bolt video! B. Example: food, lightbulbs IV. Assignments! A. Homework #6: due today at 11:59PM! B. Class participation! C. Reading: chapter 5 13
14 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 14 10/11/12 I. Positive and negative work II. Potential energy III. Conservation of energy! A. Demo and examples: Wheaties, migrating birds, ball bounce! B. Quantitative example: ball toss IV. Assignments! A. Homework #7: due Thursday at 11:59PM! B. Class participation: most & least confident going into the exam! C. Reading: finish chapter 5 14
15 PHYS 211, Sections 01 (13159) & 70 (20685)! Lecture 15 10/11/12 I. Conservation of energy! A. Demo & example: pendulum! B. Examples: colliding black holes & roller coaster! C. Conceptual questions II. Power! A. Examples: light bulbs, humans, horses, computers! B. Conceptual questions! A. Homework #7: due today at 11:59PM! B. Class participation: Atwood free body diagram! C. Reading: start chapter 6 for Thursday 15
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