PHYS 220 General Physics I

PHYS 220 General Physics I

Spring Semester 2013 Lecture 1

What we are covering this semester: Introductory physics, using mostly algebra (not calculus), which includes: •  Motion & forces •  Energy & momentum •  Rotations & oscillations •  Fluids, waves & sound •  Thermodynamics

Saved for next semester: •  Electricity & magnetism •  Optics

Some things you need to do: 1.  Get the book, lab manual, clicker 2.  Attend your scheduled Lab this week 3.  Attend scheduled Recitation on Friday 4.  Find PHYS220 home page, syllabus, schedule,

lecture notes…. 5.  Find CHIP 220 home page 6.  On CHIP, find first HW set, due Monday 7.  On CHIP, register your clicker (start next week) 8.  On CHIP, find reading quizzes (start next week) 9.  Start learning….

Some of the information in the Syllabus: Course website: www.physics.purdue.edu/phys220

Grading will be determined by Midterm Exam 1 – 15% Midterm Exam 2 – 15% Final exam – 20% Homework – 20% Reading Quizzes – 2.5% Lecture (Clicker) Quizzes – 2.5% Lab – 25% – You cannot pass the course without passing the laboratory section.

Final grades will be assigned as follows:

A = 90% – 100% B = 80% – < 90% C = 70% – < 80% D = 60% – < 70% F = < 60%

Evening Exam Schedule: Wednesday, Feb 13, 8:00 – 10:00 pm, STEW 183 Thursday, Mar 28, 8:00 – 10:00 pm, STEW 183

Final Exam - to be announced.

Get course schedule from web page:

Note the daily Assigned Reading. Read it! This will be covered by the Reading Quiz, the lecture, and the lecture (clicker) quizzes….

Lab DateAssigned Reading

Reading Quiz HW Lecture Topics

Due 9:30 amDue

11:59pm

Mon,Jan 7Syllabus, Ch1,Ch2 S1&2 L1 Introduction, what is motion

1 Wed, Jan 9 Ch2S3-6 L2 Inertia, Laws of MotionFri, Jan 11 Recitation 1

Mon, Jan 14 Ch3S1-4 RQ 3 HW 1 L3 Normal Forces, Weight, Friction, Free fall2 Wed, Jan 16 Ch3S5-7 RQ 4 L4 Transmitting forces, Problem solving, air resistance

Fri, Jan 18 Ch3S8 Recitation 2

Mon, Jan 21 ---- NO CLASS – Martin Luther King Jr. Birthday3 Wed, Jan 23 Ch4S1&2 RQ 5 HW 2 L5 Statics, projectile motion

Fri, Jan 25 ---- Recitation 3

Mon, Jan 28 Ch4S3-5 RQ 6 HW 3 L6 Reference frames, applications, Detecting Acceleration4 Wed, Jan 30 Ch5S1-3 RQ 7 L7 Uniform Circular Motion

Fri, Feb 1 ---- Recitation 4

Mon,Feb 4 Ch6S1&2 RQ 8 HW 4 L8 Force, displacement, work, kinetic energy5 Wed, Feb 6 Ch6S3-8 RQ 9 L9 Potential Energy, conservative forces, power, molecular motors


Mon, Feb 11 Ch7 RQ 10 HW 5 L10 Momentum, impulse, conservation, Collisions, center of Mass6 Wed, Feb13 CH1 – CH6 Evening Exam #1 - 8:00 pm STEW 183

Wed, Feb 13 LECTURE CANCELLEDFri, Feb 15 ---- Recitation 6

Mon, Feb 18 Ch8S1-4 RQ 11 HW 6 L11 Rotational Motion, Torque, Equilibrium, Moment of Inertia7 Wed,Feb 20 Ch8S5-6 RQ 12 L12 Rotational Dynamics, Combined motion


Mon, Feb 25 Ch9S1&2 RQ 13 HW 7 L13 Energy of rotation8 Wed, Feb 27 Ch9S3,5&6 RQ 14 L14 Ang. Momentum, Gyroscopes, Rotating Objects

Fri, Mar 1 ---- Recitation 8

Mon, Mar 4 Ch10S1-3 RQ 15 HW 8 L15 Pressure and density, Gravity on fluids, hydraulics, Pascal9 Wed, Mar 6 CH10S4-7 RQ 16 L16 Buoyancy & Archimedes', fluid motion, Bernoulli's equation…


Mon, Mar 18 CH11 RQ 17 HW 9 L17 Harmonic Motion and Elasticity10 Wed, Mar 20 Ch12S1-5 RQ 18 L18 Waves, superposition and interference


Mon, Mar 25 Ch12S7-11 RQ 19 HW 10 L19 Reflection, refraction, standing waves 11 Wed, Mar 27 LECTURE CANCELLED

Thur, Mar 28 CH6 – CH9 Evening Exam #2 - 8:00 pm STEW 183Fri, Mar 29 ---- Recitation 11

Mon, Apr 1 Ch13 RQ 20 HW 11 L20 Sound12 Wed, Apr 3 CH14S1-4 RQ 21 L21 Systems, Temp & Heat, equilibrium, phases

Fri, Apr 5 ---- Recitation 12

Mon, Apr 8 CH14S5-8 RQ 22 HW 12 L22 Thermal expansion, conduction. Convection, Radiation13 Wed, Apr 10 CH15S1-3 RQ 23 L23 Molecular picture of gases, ideal gases


Mon, Apr 15 CH15S4-6 RQ 24 HW 13 L24 Kinetic theory, diffusion14 Wed, Apr 17 Ch16S1-6 RQ 25 L25 Thermodynamics, engines


Mon, Apr 22 CH16S7-10 RQ 26 L26 Entropy and energy15 Wed, Apr 24 CH1 – CH 16 RQ 27 HW 14 L27 Review


Pendulum M9

Mechanical Waves M10

Temp. and Heat M11

Make-Up Lab

SPRING'BREAK'WEEK

Circular Motion, M4

Work & Energy, M5

Impulse & Momentum

M6

Rotational Motion M7

Make-Up Lab

Archimedes Principle M8

PHYS 220 SPRING 2013 Schedule

INTRO

Measuring, errors, M1

Newton's Laws, M2

Motion in 2D, M3

Lab make-up

For extra help, come to the Instructor’s Office Hours, or drop in the Help Center: PHYS 220 GENERAL PHYSICS Spring 2013

*All policies and scheduled activities are subject to change as necessary. 1 of 4

SYLLABUS INSTRUCTORS Lecture M,W 10:30 – 11:20 Professor Stephen M. Durbin PHYS 114 [email protected] Office Hours: M,W 1:00 – 2:00 pm PHYS 180 Lecture M,W 11:30 – 12:20 Professor Chen Yang PHYS 114 [email protected] Office Hours: M,W 3:30 - 4:30 pm BRWN 4171 D Recitation F 10:30 – 11:20 Michael Meier PHYS 114 F 11:30 – 12:20 [email protected] Office Hours: by appointment PHYS 103 Laboratory – PHYS 121 Help Center – PHYS 11 CHIP Administrator: Lab Coordinator: Dr. V.K. Saxena Dr. A. Lewicki PHYS 176 PHYS 142 [email protected] [email protected] COURSE WEBPAGE www.physics.purdue.edu/phys220 http://chip.physics.purdue.edu/public/220/spring2013/ COURSE REQUIREMENTS Prerequisites: College Algebra, Trigonometry

• Required – iClicker audience response system • Required Texts:

College Physics, Nicholas J. Giordano (Brooks/Cole) Physics 220 Laboratory Manual, A. Lewicki, S. Comer, M. Zimmer (A separate

syllabus will be provided for laboratory section procedures.)

PHYS 220 GENERAL PHYSICS Spring 2013

*All policies and scheduled activities are subject to change as necessary. 3 of 4

◦ Homework is intended to give practice at problem solving. We will use the Computerized Homework in Physics (CHIP) system. CHIP requires answers to be within 1% of the correct answer so you should carry sufficient significant figures to meet this requirement (4 is recommended). Most homework sets are due on Mondays at 11:59 pm. The CHIP grading procedures are: ▪ Multiple Choice – You have a limited number of attempts, depending on the

number of options. You will receive 100% of points if you answer correctly before the deadline and 50% of points if you answer within one week after the deadline (unless you have a valid excuse, as defined below). No points will be available for answers submitted more than one week after the deadline. There will be no late credit given for the last homework set.

▪ Numerical Problems – You have a maximum of 5 attempts to receive 100% credit (if you answer before the deadline). If you require 6 – 10 attempts, you will receive 50% credit. If you answer within one week after the deadline you may receive 50% credit for answers requiring up to 5 attempts. No credit is given for answers submitted after one week after the deadline, answers requiring 6 – 10 attempts in the week after the deadline, or answers requiring more than 10 attempts before the deadline. There will be no late credit given for the last homework set.

◦ Recitation will involve practice problem solving. Clickers will be employed and will

count towards your grade just like in lectures. This is an opportunity to get help with homework and other practice problems.

◦ The Help Center for PHYS 220 is located in PHYS 11, and will be staffed on Fridays

and Mondays; see the course home page for exact hours. This is an excellent free resource for getting additional guidance on solving the homework problems.

◦ Two midterm evening exams will be given, on the dates noted above (page 2). Exams

will consist of multiple choice questions. You should bring a pencil (or two) and a calculator. No additional materials will be allowed. Those with adaptive learner status must make arrangements with their lecturer no less than one week before the exam. If you have a legitimate (i.e. Purdue approved) conflict with a test date, you must notify your lecturer at least two weeks before each exam to make arrangements.

◦ Attendance and Participation

▪ Lab attendance is required. Automatic failure will result from an unexcused

absence from more than two labs.

▪ Participation and performance points are earned from the Clicker quizzes in both lectures and recitations; combined with the Reading Quizzes, these will be worth 5% of your grade. No excused absences will be given for Clicker quizzes; instead the three lowest scores will be dropped for all students, to account for unavoidable situations where lecture attendance is not possible.

See the complete syllabus for much more information on course policies & procedures. You will be responsible for knowing these.

Some things we assume you know   Scientific Notation

  Significant Figures

  Converting Units

  SI system (m,kg,s)

  Powers of 10

  Algebra/solving simultaneous equations

  Trigonometry

  Scalar vs. Vector

  Vector math (addition, multiplication, etc.)

Refresher given in Chapter 1

Motion   Start our study in 1 dimension (along a straight line).

  We can measure the motion of an object by measuring its position at regular intervals of time and plotting (motion diagram).

Motion   Distance per unit time is speed (scalar, never

negative) m/s.

  Speed is not the same as velocity.

  Velocity is a vector (also contains information about the direction of motion). In one dimension, there is only one component.

speed= ∣v∣ (one dimension )speed= ∣ v⃗∣ (two or threedimensions )

Motion   Velocity is related to position.

  Change in displacement in a given time interval

Instantaneous Motion   Average velocity loses all detail of what

happens during the interval.

  Better representation of motion with a smaller interval.

Instantaneous Motion Concept Check: Is there a point on this graph

where the velocity is 0?

Velocity Concept Check: Match the graph

with the description –  The velocity increases with time

–  The velocity decreases with time

–  The velocity is constant (does not change with time)

Acceleration   Acceleration is a vector related to how the

velocity changes with time.

  Again, smaller and smaller time intervals give better measures of what is happening in an instant.

  Acceleration and velocity may not point in the same direction and may not be maximized at the same point in time.

avgva =t

ΔΔ

Motion   Concept Check: The position-time curve of a

hypothetical object is shown. Which of the following scenarios might it fit?

–  A car starting from rest when a traffic light turns green.

–  A car coming slowly to a stop when a light turns red.

–  A bowling ball rolling toward the pins.

–  A runner slowing from top speed to a stop at the end of a race.

Example A nut falls from the top of a very tall tree. Initially,

the nut is at the top of the tree, 50m from the ground. After 1s, the nut is 45m above the ground and at 2s the nut is 30m above the ground. Use these measurements to calculate the average acceleration of the nut during the fall.

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PHYS 220 General Physics I