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Iowa State - PHYS - 221
Lecture 7Relative MotionGoals for Lecture 7 Define Galilean transformation laws between moving reference frames. Define inertial reference frames where Newton's laws live (even though we still don't know about Newton's laws.).Upside downGali
Iowa State - PHYS - 221
Lecture 8Forces: Newton's First and SecondWhat is a force?It's a pull or a push. F FIt has a magnitude and a directionForces are vectors!Types of forces1. Contact forces:- Normal force (always perpendicular to contact surface); it's the
Iowa State - PHYS - 221
Lecture 9 : Newton's Third and Free Body DiagramsI SOMETIMES WISH NEWTON HAD STOPPED AT TWO LAWS.Newton's Third LawFor every force, or action there is an equal but opposite force, or reaction.Forces ALWAYS happen in pairs.FABFBANewton
Iowa State - PHYS - 221
Lecture 10Applying Newton's LawsACT: Bowling on the MoonAn astronaut on Earth kicks a bowling ball horizontally and hurts his foot. A year later, the same astronaut kicks a bowling ball on the moon with the same force. His foot hurts:Ouch!A. M
Iowa State - PHYS - 221
Applying Newton's LawsLecture 12Goals of Today's LectureBeing able to apply Newton's laws to any problem that is not insane.EXAMPLE: Incline and pulley, with frictionSame system, but S = 0.2 and k = 0.1 What happens when the system is releas
Iowa State - PHYS - 221
Lecture 13Work and the Work/Kinetic Energy TheoremMotivation to go beyond Newton's lawsNLoop the loopmgN NmgRThe normal force has different mg direction and magnitude at every point on the track!Writing and solving Newton's laws can b
Iowa State - PHYS - 221
Lecture 14Work: Varying forces and curved trajectories PowerACT: Zero net workThe system of pulleys shown below is used to lift a bag of mass M at constant speed a distance h from the floor. What is the work done by the person?A. MghB. MghC.
Iowa State - PHYS - 221
Potential energyBasic energyKinetic energyEnergy Conservation; Potential EnergyLecture 15You are speeding down the road without a care in the world and just as you are approaching a sharp curve in the road above a scenic overlook you notice
Iowa State - PHYS - 221
Lecture 16Conservative and Non-Conservative Forces Examples.ACT: Falling objectsThree objects of mass m are dropped from a height h. One falls straight down, one slides down a frictionless incline and one swings at the end of a pendulum. What is
Iowa State - PHYS - 221
Lecture 17Energy DiagramsACT: Force fieldThe pictures below show force vectors at different points in space for two different forces. Which of these forces is conservative?12A. 1B. 2C. BothWork along a closed trajectories (loops).W=
Wisconsin - LING - 101
Linguistics 101/301 Exam #1: Review1. Definitions Dialect: See below. Idiolect: The language variety of an individual speaker. Isogloss: Lines drawn on maps dividing dialect areas. Transition Zone: Hypercorrection: Over generalization of particular
Wisconsin - LING - 101
1. Definitions: Lexicon:Word:Morpheme:Allomorph:affix (prefix, infix, suffix):Root:Base:Morphophonemics:Inflection:Derivation:2. Phonology problems: Minimal pairs: Near minimal pairs:Complementary distribution:Listing environm
Wisconsin - LING - 101
Constituent: Antecedent Coreference: Deixis: Sprachbund: Lexicon (Categories vs. Non Lexical) Computational system Meaning: Inflection Distribution Substitution Test Movement Test Coordination Test: Heads SpecifiersComplements: Complementizer Merge
Wisconsin - LING - 101
Final Exam Review The exam will be cumulative, but will focus on material we have covered since the second exam. But do go over the two previous review summaries. 1. Definitions: Constituent: function of a unit in syntax Antecedent: The element that
Wisconsin - ANTHRO - 104
Anthropology Study Guide Test 1 Origins of Cultural Anthropology 19th century is when field really kicks off and gets more serious From Armchair Anthropology Sir James Frazer (1854-1941) Author, The Golden Bough Didn't leave their office or "arm
Iowa State - PHYS - 221
Lecture 18Linear Momentum and ImpulseMomentum and Newton's Second LawFnetmadv m dtd mv dtdp dtmvLinear momentum pNewton's second law in terms of linear momentum: A net force is a transfer of linear momentum.Fnetdp
Iowa State - PHYS - 221
Lecture 19Elastic and Inelastic CollisionsEnergy versus Momentum Energy comes in a multitude of forms There is just one kind of momentum Energy is a scalar Momentum is a vector Transfer of energy by a force=work Transfer of momentum by a for
Iowa State - PHYS - 221
Lecture 20Center of MassExample: Elastic collisionWhat is the velocity of each block if the collision is elastic? Before1 kgv1 = 10 m/s5 kgv2 = 2.0 m/sA. 2.0 m/s, 10 m/sB. 5.3 m/s, 2.7 m/s C. -5.3 m/s, 2.7 m/s D. -3.3 m/s, 2.7 m/s E. -3
Iowa State - PHYS - 221
Lecture 21Rotations of a Rigid Body. Moment of inertiaReview of circular motionDescription in terms of angular quantities (in radians!): Relation to linear quantities:;s = Rd ; dtv Rd dtatan Ry atan atotal R ac s Centripetal acce
Iowa State - PHYS - 221
Lecture 22 TorqueACT: SpheresTwo spheres have the same radius and equal masses. One is made of solid aluminum and the other is a hollow shell of gold.Which one has the biggest moment of inertia about an axis through its center?Mass is further aw
Iowa State - PHYS - 221
Lecture 40Power. Circuits.ACT: Switch on the lampWhen a lamp is switched on, the time it takes to light up is:A. Equal to the time needed by the electrons Typical drift in the socket to get to the lamp.B. Zero, it's instantaneous.speed is ~
Iowa State - PHYS - 221
Lecture 23Work and power for rotations. Examples.ACT: Heavy (real) pulleysTwo blocks of masses m1 and m2 (> m1 ) are connected through a string that goes through two different pulleys. Pulley 1 is made of plastic. Pulley 2 is made of iron. In bot
Iowa State - PHYS - 221
Lecture 24Angular MomentumAngular MomentumWe want an equivalent ofpand ofFnetdp dtAngular momentum:Lrpm (r v )Just as linear momentum quantifies the amount of motion, angular momentum quantifies the amount of r
Iowa State - PHYS - 221
Lecture 25StaticsEquilibriumA system is in equilibrium if no part of it is moving.FConditions for equilibrium:0and 0CM is at restParts are not moving about the CM.A very useful feature: The system should not rotate about ANY a
Iowa State - PHYS - 221
Lecture 26Simple Harmonic MotionPeriodic motionA motion is called periodic when the system comes back to the same situation every time interval T.Same positionPeriodFrequencySame velocityf2 fExamples:T1 2Uniform circular motionEa
Iowa State - PHYS - 221
Lecture 27The Pendulum Damped and Forced OscillationsACT: Energy oscillationsA mass m = 5 kg oscillates at the end of a spring of constant k = 2000 N/m. At t = 0, its acceleration is maximum. How long will it take before the potential energy reac
Iowa State - PHYS - 221
Lecture 28Newton's Law of GravityNewton and the MoonWhat is the centripetal acceleration of the Moon for its rotation around the Earth?We know (Newton also knew):T = 27.3 days = 2.36 rmoon-Earth = 3.84REarth = 6.35106 m106 s108 m(see Ap
Iowa State - PHYS - 221
Lecture 29Orbits. Kepler's laws.ACT: Gravitational forcesTwo stars of masses M and 2M are separated by a distance d. A spaceship travels between the two stars. The net gravitational force on the spaceship is zero when the spaceship is:dM2M
Iowa State - PHYS - 221
Lecture 30Electric Charge Coulomb's LawThe factsWhen some objects are rubbed with fur, tissue paper, certain fabrics, etc, they sometimes attract or repel each other. The repulsive/attractive force depends on the distance between the objects, on
Iowa State - PHYS - 221
Lecture 31Electric FieldsACT: Two ballsTwo balls of equal mass are suspended from the ceiling with nonconducting wire. One ball is given a charge q and the other is given a charge 3q. Which of the following best represents the equilibrium positio
Iowa State - PHYS - 221
Lecture 32Electric field lines. The electric dipole.Example: The electric dipole+d-p+Q-QDefinition: Electric dipole momentpQdDirection: From to +What happens to a dipole in an external electric field?An electric dipol
Iowa State - PHYS - 221
Lecture 33Electric Flux Gauss's LawFlux in GeneralDEMO: LoopFlux: How much of something is passing through a surface.How many hairs are passing through your scalp. If you dip a tennis racquet in a river, how much water flows through it?Ma
Iowa State - PHYS - 221
Lecture 34Applications of Gauss's LawACT: Crossed planesWhich diagram corresponds to the E-field lines for these two uniformly charged infinite sheets that intersect each other as shown? +++Each sheet produces a uniform electric field
Iowa State - PHYS - 221
Lecture 35Electric Potential Energy and Electric PotentialElectric potential energyElectric forces are conservative (Coulomb's law is mathematically identical to Newton's gravitational force, which is conservative).So we can write the work done
Iowa State - PHYS - 221
Lecture 36More Example of Electric Potential. Equipotentials. Lightning rods and why you lose your radio station inside tunnels.Example: Getting the electric field from the electric potentialWe saw last time that EV5y 4z 2Example: Find t
Iowa State - PHYS - 221
Lecture 37CapacitanceCapacitorsA capacitor is a device whose purpose is to store electric energy which can be released in a controlled manner. Usually made of two conductors with charges +Q and Q.-Q+Q. separated by an insulator (dielectric)
Iowa State - PHYS - 221
Lecture 38Electric energy Capacitors with dielectricsEnergy stored in a capacitor= external work needed to charge itWork to add a charge dq to a capacitor with capacitance C and charge q:dWextdWelectricdUVdqq dq CTotal work: WextQ
Iowa State - PHYS - 221
Lecture 39Current. Resistance. Ohm's law.Electric current= charges in motion.CurrentIdQ dtUnits: A (Ampere) 1 A = 1 C/sCurrent density(current per crosssectional area)JdI dAIAfor uniform currentA = cross-sectional area(Exam
Iowa State - PHYS - 221
PHYSICS 221 Fall 2006 EXAM 1: October 4 2006 8:00pm-10:00pmName (printed): _ ID Number: _ Recitation Instructor: _ Section #_INSTRUCTIONS:This exam contains 30 equally weighted multiple-choice questions. Choose one answer only for each question. C
Iowa State - PHYS - 221
ExamI Physics 221,FaLt20071. A book is at rest on a desk top. Which of the following forces forms a Newton's third law pair with the book's weight? A) The normal force of the table on the book B) The force of the book on the table ;Q The gravitatio
Iowa State - PHYS - 221
PHYSICS 221 Fall 2007 EXAM 1: October 3, 2007 8:00pm-10:00pmName (printed): _ Recitation Instructor: _ Section #_INSTRUCTIONS:This exam contains 25 multiple-choice questions plus 2 extra credit questions, each worth 3 points. Choose one answer onl
Iowa State - PHYS - 221
Physics 221 2005S Exam 1-solutionsPHYSICS 221 Spring 2005 EXAM 1: Feb 17 2005 8:00pm-10:00pmName (printed): _ ID Number: _ Section Number: __ INSTRUCTIONS:Each question is of equal weight, answer all questions. All questions are multiple choice.
Iowa State - PHYS - 221
Physics 221 2005S Exam 1PHYSICS 221 Spring 2005 EXAM 1: Feb 17 2005 8:00pm-10:00pmName (printed): _ ID Number: _ Section Number: __ INSTRUCTIONS:Each question is of equal weight, answer all questions. All questions are multiple choice. Choose the
Iowa State - PHYS - 221
Physics 221 2006 S Exam 1 SolutionsAnswer Key Solutions Questions 1 2 11Answer Key1 2 3 4 5 6 7 8 9 10 B E E C D D B A C D 11 12 13 14 15 16 17 18 19 20 E E A D A C A E C B 21 22 23 24 25 26 27 28 29 30 C A C B B A C C D BPage 1 of 27Physics
Iowa State - PHYS - 221
Physics 221 Spring 2006 Exam 1PHYSICS 221 Spring 2006 EXAM 1: Feb 16 2006 8:00pm-10:00pmName (printed): _ ID Number: _ Section Number: __ INSTRUCTIONS:Each question is of equal weight, answer all questions. All questions are multiple choice. Choo
Iowa State - PHYS - 221
PHYSICS 221 Summer 2005 EXAM 1: June 27, 2005 - SolutionsName (printed): _ ID Number: _ Section Number: _ INSTRUCTIONS:Questions 1-10 are worth one point each, 11-15 are worth two points, as marked. Answer all questions. All questions are multiple
Iowa State - PHYS - 221
KLI /A*rswEtSPHYSICS221 FALL 2OO5 EXAM IIName (printed): lD Number: SectionNumber: RecitationInstruction:INSTRUCTIONS:Put away all materialsexceptfor pens,pencils, erasers and your calculator.ll.This l2O-minuteexamcontains30 equallyweightedmu
Iowa State - PHYS - 221
PHYSICS 221 Fall 2006 EXAM 2: November 15 2006 8:00pm-10:00pmName (printed): _ ID Number: _ Recitation Instructor: _ Section #_INSTRUCTIONS:This exam contains 28 equally weighted multiple-choice questions, numbered 31 through 58. Choose one answe
Iowa State - PHYS - 221
PHYSTCS 221 Fall 2007 EXAM2: November 20078:00pm-10:00pm 14,(printed): Name Recitation Instructor:INSTRUCTIONS:Thisexam contalns multiple-choicequestions plus 2 extracredit questions, each worth 3 25 points. Chooseone answer only for each question
Iowa State - PHYS - 221
PHYSICS 221 Fall 2007 EXAM 2: November 14, 2007 8:00pm-10:00pmName (printed): _ Recitation Instructor: _ Section #_INSTRUCTIONS:This exam contains 25 multiple-choice questions plus 2 extra credit questions, each worth 3 points. Choose one answer o
Iowa State - PHYS - 221
Physics 221 2006 S Exam 2 SolutionsAnswer key Solutions Questions1 2 931 32 33 34 35 36 37 38 39 40C C D C B B E A E B41 42 43 44 45 46 47 48 49 50A B C A C A D C B D51 52 53 54 55 56 57 58A B D E E E C E-1-Physics 221 2006 S Exam
Iowa State - PHYS - 221
Physics 221 Spring 2006 Exam 2PHYSICS 221 Spring 2006 EXAM 2: March 30 2006 8:00pm-10:00pmName (printed): _ ID Number: _ Section Number: __ INSTRUCTIONS:Each question is of equal weight, answer all questions. All questions are multiple choice. Ch
Iowa State - PHYS - 221
For all problems, use g=10m/s2 The correct answers are indicated in blue italics.16. (1 point) In which of the following solid objects of uniform density does the center of mass NOT lie within the mass of the body? A. A cube B. A doughnut C. A spher
Iowa State - PHYS - 221
PHYSICS 221 EXAM3
Iowa State - PHYS - 221
Mark answers in spaces 31-43 on the answer sheetPHYSICS 221 Summer 2005 EXAM 3: July 25 2005 9:50pm-10:50pmName (printed): _ ID Number: _ Section Number: __ INSTRUCTIONS:Some questions are one point, others are two points, as marked. Answer all qu
Iowa State - PHYS - 221
PHYSICS 221 Fall 2006 FINAL EXAM: December 12 2006 7:00pm-9:00pmName (printed): _ ID Number: _ Recitation Instructor: _ Section #_INSTRUCTIONS:This exam contains 28 equally weighted multiple-choice questions (24 regular questions + 4 lab question
Iowa State - PHYS - 221
PHYSICS 221 Fall 2006 FINAL EXAM: December 12 2006 7:00pm-9:00pmName (printed): _ ID Number: _ Recitation Instructor: _ Section #_INSTRUCTIONS:This exam contains 28 equally weighted multiple-choice questions (24 regular questions + 4 lab question