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Day 1(1/8)(A)Introduction If you got here, you know where to find the homework! The big website is located at <www.geocities.com/jryono> backup site <members.fortunecity.com/jryono> You'll find Practice Quizzes(with answers). You'll also find Notes. Chapter Review Answers and Extra Practice Problem Answers are also here. (Practice Problems have solutions at the back of your text, but you knew that, right?!) Mr R's email address <"[email protected]>; Check out the sidebar TOPICS to see some photos of various physics toys and demonstrations. (See Mr R if you want your picture on our website! (B)1st Semester Physics Review - Projectile Motion(including vectors,Law of Falling Bodies,The Derivative,acceleration as a change in velocity vs speed),Bed of Nails,Tearing a telephone book in half (C)Chapter 10 (We'll start with Energy) 'Easy Definition' of Work: W=Fd (Watch out, a better definition is coming soon!) units of work [W]=J(joule)=Nm(newton-meter) Hwk - p.227 #1-4 + 5pt assignment to email [email protected] Day 2(1/10)-Extending our concept of work... The force must be in the direction of the displacement. 0J of work is possible. Friction usually does 'negative work'. The force of gravity does positive work when an object descends. It does negative work as the object rises. *Review Def/Force of Gravity = Weight (near the surface of the earth, w = mg where we use either g=9.8m/s^2 or g=10m/s^2) weight(force of gravity) vs mass(inertia,the tendency to resist acceleration), weight(w) vs apparent weight(w') Elevator Problems - F=ma (as a magnitude statement) acceleraton(magnitude vs direction) Def/ equilibrium Hooke's Law - F=-kx /SHM = sine waves (trigonometry) If the force is angled, we'll need to do some vector work! A better definition of work is... Practice Quiz on Work We'll come back to Simple Machines Hwk-p.229 #6-8 /pp.241-242 #9,19-22,24 Day 3(1/14)-Go over Hwk & Practice Work Quiz Hooke's Law for Spring Forces F = -kx /How do we determine the spring constant,[k]=N/m? ex/Spring Lab - hang a mass of 1kg and... or use a spring scale and meter stick... ex/If k=20N/m and we stretch a horizontal spring .4m, how much work does the spring force do? Graphs of constant forces over distance. Graph of a spring force over distance. How do we calculate the work done by a force that varies in strength? (Fancy calculus definition of work) SHM demos - spring-mass system,pendulum period (T=1/f) vs frequency T=6.28(m/k)^.5 each system has a 'natural frequency' depending upon its physical properties. Hwk-pp.242-243 #23,25,26abcd,33,34 Work Quiz - next class meeting Day 4(1/15)-Work Quiz Kinetic Energy (energy of motion) Def/ K.E. or K = (mv^2)/2 How does work relate to kinetic energy? Work-Energy Theorem/ net W = Kf - Ki *Review-Friction(Static vs Kinetic)forces vs coefficients of friction,normal forces Hwk-p.243 #36,38-41 /p.251 #1,2bcde,3,4 Day 5(1/18)-Return Work Quiz BED OF NAILS Potential Energy (A)Gravitational Ug = mgh (B)Elastic(spring) Us = (kx^2)/2 Reference Level for GPE or (Ug=0J at the Earth's surface) vs... Ug vs the change in potential energy (Ug-Ui) (delta notation: final - initial) Mechanical Energy, E = K + Ug + Ue where Ue = elastic potential energy Does not include heat energy,Q Roller Coaster Practice Quiz Work-Energy Thm (practice) Hwk-p.254 #5-8 /p.267 #3-11 Day 6(1/23)-Roller Coaster Quiz Heat(Q) /specific heat,C(J/kg-K) /heat of fusion Hf(J/kg) /heat of vaporization Hv(J/kg) Phase Change Diagram - (p.286) Temperature(Kelvin or Celsius) vs Heat Added (joules) WATER C(ice)=2060 vs C(water)=4180 vs C(water vapor)=2020 Heat of Fusion = 3.34x10^5 Heat of Vaporization = 2.26x10^6 Hwk-pp.261-2 #9-12 /p.268 #14,15,17,38 or 39, 41 or 42,44,45 Day 7(1/25)-Online Bridge Building Contest Presentation by Carla Moreno(Association of Civil Engineers) return Roller Coaster Quizzes(re-quiz?) Momentum (Chapter 9) p=mv (emphasize velocity(vector) rather than speed Impulse J=Ft (another 'vector' statement) Impulse Momentum Thm - (net)J = change in momentum (Pf - Pi) ex/ p.261 ex/ Drop a ball for 1.2sec. What is it's velocity? speed? Impulse-Momentum Thm Hwk-p.270 #48,50,51,56,58,59,66 /p.204 #2,4,6 /p.217 #4,7,12,23,25 Day 8(1/29)- Collisions elastic vs semielastic vs inelastic Conservation of Momentum - (when an isolated system has no 'net external force') Impulse-Momentum Practice Quiz Ch 12 Thermal Energy Unit Class Worksheet - Specific Heat, Heats of Fusion and Vaporization, Change of State Hwk-p.270 54,60,65,68 /p.210 #7,9,11 p.218 #10,15,16,18,19,21 Day 9(1/31)-Conservation of Momentum in 2 Dimensions - Film (Pool) Center of Mass Torque and Rotational Equilibrium Impulse-Momentum Quiz (coming soonish) Hwk - p.214 #14,15,16 /p.218 #24,27,29,31,32 Day 10(2/4)-Finish practice quiz on Impulse & Momentum Red Wagon Problem (with rain) Classwork - practice quiz on Work & Energy Newton's Cradle Hwk - pp.219-221 #35,39,43,44,47 Day 11(2/6)-Simple Machines - pulleys, inclined planes,wheel and axle(gear ratio),levers(fulcrum,effort force vs lift force) IMA (ideal mechanical advantage) vs MA Efficiency (percentage) = [MA/IMA] x100 = [W(output)/W(input)] x100 Static Electricity + Coulomb's Law Ch 20 Inverse Square Law Coulomb's Constant k = 9.0x10^9 (SI units) charge [q]=C(coulomb) elementary unit of charge, 1e=1.6x10^-19C q(proton)=1e vs q(electron)=-1e particle - mass electron 9.11x10^-31kg proton 1.67x10^-27kg neutron 1.67x10^-27kg (little heavier) Hwk - p.220-221 #45,48 /p.244 #48,49,51 p.270 #62,63,70,71,72 Momentum Quiz (next class) Day 12(2/8)- Momentum Quiz ex/p.474 Practice Quiz on Coulomb's Law Hwk - p.244 #50,52,53,55 p.270 #67,68,69 p.476 #1-5 Work-Energy Quiz (next class) Day 13(2/12)- Return and go over momentum quiz Finish up Coulomb's practice quiz Work-Energy Quiz(postponed to next class) XC Lunch Film - Resonance Hwk - p.478 #20,21,25,28,29,32 p.515 #5-7,8a /p.517 #11-13 Day 14(2/14)-Catching up on E&M ex/p.475 (vectors!) - warning to students who only study the practice quizzes Current Electricity Chapter 22 Current(I)-rate of charge flow [I]=C/s=A(ampere or amp) Voltage or Potential(V)-energy per coulomb [V]=J/C=V(volt) weird? 2 V's???? Resistance(R)-impedes current [R]=ohm (capital Greek omega) Ohm's Law V=IR (usually works) Water Pump Analogy - pump acts like the battery /giving the water(charge) GPE(or for one charge,'potential') /the pipes are like the wires(for now, we'll assume no resistance in the pipes or wires) /the waterwheel(filament in the lightbulb) converts or uses the energy /and we need a complete circuit for our pump to keep working. Series & Parallel Circuits Ch 23 Series (resistors) - Equivalent(or Total) Resistance /Current is the same through each resistor. /Conventional Current(positive charge flow) vs the actual negative electron flow direction /Voltage Drops/Rises /Voltage is proportional to each resistor's value. Loop Rule Hwk - p.478 #26,27,30,31,33 p.534 #1-5 /p.537 #6,7 /p.540 #11 Day 15(2/20)-Return and go over Work-Energy Quizzes Practice Series Circuits Quiz Parallel(resistors) Circuits - Equivalent Resistance /Voltage is the same across each resistor. /Current flowing into a junction or point equals the current flowing out. Point Rule /Think: "Current takes the path of least resistance." Hwk - p.540 #10,12 /p.551 #22,28,33 Practice Parallel Circuits Quiz Momentum Makeup Quiz (if there's time at the end of the period) Day 16(2/22)-Series Circuits Quiz Cartoon Films on V=IR Voltmeters & Ammeters fuses,circuit breakers,ground-fault interrupters Power is the rate at which work is done or energy is delivered.P = Work/time [P]=J/s=W(watt) Electric Power is the same except most often calculated using: P = VI = (V^2)/R = (I^2)R kilowatt-hour(kWh)? 60-watt lightbulb? Last Chance Lunch Film - Frames of Reference Hwk - p.547 #13 /p.551 #21,26,32,34,35 p.511 #1,3 /p.515 #8b,9,10 Day 17(2/26)-Go over Series Quizzes Surprise Parallel Circuits Quiz More Circuits and Power Parallel Series Combinations Light Rack Lab Hwk - p.512 #2,4 /p.525 #18,19 p.527 #21-31(odd) /p.552 #23,24 Surprise Coulomb Quiz coming soon! (very soon, Robert!) Day 18(2/28)-Surprise Coulomb's Law Quiz at the end of the period (Review time in class) Return Parallel Circuits Quiz Go over Light Rack Lab - schematics Electric Fields Chapter 21 E-fields - force per unit charge [E]=N/C Hwk - p.484 #1-4 /p.503 #23,26,27 Day 19(3/4)- Return and go over Coulomb's Law Quiz E-field - Signpost Analogy g-fields [g]=N/kg (force per unit mass) (1)Electric field due to a point charge (2)E-field lines for a + and - charge (3)E-field lines for two charges(+) and (-) (4)E-field lines - two parallel plates(+,-) Potential vs EPE and GPE (V vs U) ex/ U=mgh m=3kg,h=2m then U=60J (GPE or U) potential, V=20J/kg (potential or V) which is better to label tops of buildings? W=? for a 5kg mass falling... Potential Difference between A and B Va-Vb=Vab so if a charge of 3C falls thru a potential drop of 20V or 20J/C, then... W=qV (here 3(20)=60J) going from A to B (Notice Vab=Va-Vb is the opposite of delta-V which is Vf-Vi=Vb-Va=Vba=-Vab whew!) Topo maps - Equipotential(contour)lines Gravity Analogy (works for only + charges) 3D picture and 2D field map Hwk - Practice Circuits Test Circuits Test coming soon Day 20(3/6)- Parallel-Series Combinations Weird Students Circuits Switches and short circuits <skip capacitance for now> Practice E-field and Potential(V) Quiz Hwk - pp.502-3 #1-5,12,24,25,28,29 Circuits Test next class Day 21(3/8)- Magnetic Fields (B-fields) magnetic domains, materials magnetic force on a magnet compass needle as a balanced magnet Magnetic Field Lines Right-thumb Wrapping Rule /Ampere's Law Oersted's experiment B-Field Demos(tiny compasses,solenoid) Circuits Test(1st try) Hwk - p.504 #32-35 /p.560 #2 /p.563 #4-6 2nd Try on Circuits Test (next class) Day 22(3/12)- Go over Circuits - then test E-field and Potential(V) practice quiz F=qvB or F=Ilb (???) magnetic force of a charged particle Right-hand Rule Hwk - p.569 #7,9 /p.574 #11,13 p.575 #1,2,4,6,7,8 E-field & V(potential) Quiz next class Day 23(3/14)- F=qvB or F=Ilb (???) magnetic force of a charged particle Right-hand Rule E-field & V(potential) Quiz Hwk - p.569 #8 /p.574 #10,12 p.576 #22,26,28,33,34,37,43,53 Eboard is charging $$$. So this is our message board! Get current homework assignments here. For past assignments go to our website 'www.geocities.com/jryono' Day 24(3/18) - Return and go over E-field and V(potential) Quiz (unless some make-up quizzes still need to be completed) Practice Quiz on F=qvB and F=IlB (Right-hand Rule) Ch 25 Electromagnetic Induction (Faraday's Law) Induced voltage (EMF) and induced current Lenz' Law - copper tube vs gravity demo Electric motors/generators Transformers (turn ratio? primary vs secondary coils?) Hwk - p.577 #29,30,35,38,39,44,49 p. 597 #9 /p.598 #1,10,26,41 Day 25(3/20) - Mass Spectrometer (isotopes, W=qV, velocity selector qvB=qE, F=m(v^2)/r ) Self-Induction (closing the switch, I vs t graph) Concave Mirror (2 cases) Principal Ray Diagram Image Description (1)upright vs inverted (2)magnified vs smaller (or same size) (3) real vs virtual Hwk - p.578 #45,47,49,53 /p.597 #11 /p.600 #41,43 /p.610 #5 /p.621 #1-3,19 F=qvB or F=IlB Quiz on Right-hand Rule (next class) Day 26(3/22) - Quiz on Right-hand Rule for F=qvB Popcorn Speaker Demo (speaker vs microphone) Hand Generator Demo (electric motor vs generator) Short Wave Light Demo (lightbulb demo) Chapter 14 Waves (mechanical vs em radiation) tranverse vs longitudinal (water waves - both) crest vs trough, amplitude, wavelength, (time)period vs frequency (cps or Hz) f = 1/T Wave Speed = frequency x wavelength Interference (constructive vs destructive) relection, refraction, diffraction Chapter 18 Mirrors Plane Mirror (virtual image) half a full-length needed mirror equation 1/d' + 1/d = 1/f (focus vs radius) magnification ratio m = h'/h = -d'/d Convex Mirror (virtual image/negative focal length) Practice Mirror Quiz Hwk p.344 #2,5,35,37,39 /p.425 #2 /p.427 #6 Day 27(4/2) - Finish Practice Mirror Quiz Ch 17 Reflection/Refraction Snell's Law (Refraction) Index of Refraction(n) vs speed of light(c) Practice Quiz on Reflection/Refraction Mirror Demos Hwk - p.400 #1,3 /p.402 #5a,6 /p.411 #19,50 p.425 #4 /p.427 #7 Study for Mirror Quiz (next class) Lunch Film AC vs DC Day 28(4/4) - Mirror Quiz Critical Angle and Total Internal Reflection Demos - Fish tank, fiber optics Finish Reflection/Refractin Quiz Double Convex Lens - converging or positive (2 cases) Double Concave Lens - diverging or negative lens Practice Lens Quiz Hwk - p.400 #2,4 /p.402 #5b /p.411 #33,51 p.432 #9 /p.435 #12 Day 29(4/8) - Return and go over Mirror Quiz Requiz on Mirrors (same period!) Liter Bottle - total internal reflection Hwk - p.432 #10 /p.435 #13 p.412 #34,37,42,57 Day 30(4/10) - Return 2nd Mirror Quiz Film on Waves Binoculars and critical angle review practice Reflection/Refraction Quiz finish practice Lens Quiz - negative or diverging or double concave lens Hwk - p.432 #11 /p.435 #14 p.441 #35,37,39 Study for Reflection/Refraction Quiz (next class) Day 31(4/12) - Reflection/Refraction Quiz Color and Dispersion Thin Film interference /Rainbows /Bubbles Ch 19 Diffraction Double-slit interference pattern y/L = lambda/d where L is screen distance, d is distance between slits, y is the location of the brightness fringe Hwk - p.412 #54,55,56 /p.451 #4 Study for Lens Quiz (next class) Day 32(4/16) - Lens Quiz (end of period) Single-slit interference (use slit width, w, in place of d)... so y/L = lambda/w Doppler Effect Notes - including echoes Hwk - p.458 #16,19 /practice quiz on Doppler Effect Day 33(4/18) - Return 'Trick' Lens Quiz Doppler Effect review of basic problems Sonic Booms, Shock Waves, Mach 1 Take the 'Real' Lens Quiz Hwk - p.458 #17,20 Doppler Quiz (next,next class) Day 34(4/22) - Doppler Effect - Echo and Wind Chapter 28 Bohr Model of the Atom First some historical background... J.J.Thomson - discovers the electron (plum pudding model of the atom) relationship between frequency and energy, E = hf Planck's constant 6.63x10^(-34) Js (joule-seconds) Planck - quantized energy (E=nhf), hot body radiation Einstein - photoelectric effect (higher frequency ultraviolet light causing electricity) Spectral Lines? Balmer(Swiss mathematician) - formula for the spectral lines of hydrogen Rutherford - gold foil experiment, discovers the nucleus (nuclear or planetary model of the atom) Bohr - quantized energy levels (Bohr model of the hydrogen atom), Bohr radius prediction (still good!), ionization energy, the first or principal quantum number(n) vs Quantum Model Hwk - p.641 #3,4,5 Study for Doppler Quiz Day 35(4/24)- Doppler Quiz Practice Quiz - Bohr Model of the Atom Hwk - p.665 #1-3,5-7 Complete Bohr Model practice quiz