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Vincent SelhorstJones
Power & Simple Machines
Slide Duration:Table of Contents
I. Motion
Math Review
16m 49s
 Intro0:00
 The Metric System0:26
 Distance, Mass, Volume, and Time0:27
 Scientific Notation1:40
 Examples: 47,000,000,000 and 0.000000021:41
 Significant Figures3:18
 Significant Figures Overview3:19
 Properties of Significant Figures4:04
 How Significant Figures Interact7:00
 Trigonometry Review8:57
 Pythagorean Theorem, sine, cosine, and tangent8:58
 Inverse Trigonometric Functions9:48
 Inverse Trigonometric Functions9:49
 Vectors10:44
 Vectors10:45
 Scalars12:10
 Scalars12:11
 Breaking a Vector into Components13:17
 Breaking a Vector into Components13:18
 Length of a Vector13:58
 Length of a Vector13:59
 Relationship Between Length, Angle, and Coordinates14:45
One Dimensional Kinematics
26m 2s
 Intro0:00
 Position0:06
 Definition and Example of Position0:07
 Distance1:11
 Definition and Example of Distance1:12
 Displacement1:34
 Definition and Example of Displacement1:35
 Comparison2:45
 Distance vs. Displacement2:46
 Notation2:54
 Notation for Location, Distance, and Displacement2:55
 Speed3:32
 Definition and Formula for Speed3:33
 Example: Speed3:51
 Velocity4:23
 Definition and Formula for Velocity4:24
 ∆  Greek: 'Delta'5:01
 ∆ or 'Change In'5:02
 Acceleration6:02
 Definition and Formula for Acceleration6:03
 Example: Acceleration6:38
 Gravity7:31
 Gravity7:32
 Formulas8:44
 Kinematics Formula 18:45
 Kinematics Formula 29:32
 Definitional Formulas14:00
 Example 1: Speed of a Rock Being Thrown14:12
 Example 2: How Long Does It Take for the Rock to Hit the Ground?15:37
 Example 3: Acceleration of a Biker21:09
 Example 4: Velocity and Displacement of a UFO22:43
MultiDimensional Kinematics
29m 59s
 Intro0:00
 What's Different About Multiple Dimensions?0:07
 Scalars and Vectors0:08
 A Note on Vectors2:12
 Indicating Vectors2:13
 Position3:03
 Position3:04
 Distance and Displacement3:35
 Distance and Displacement: Definitions3:36
 Distance and Displacement: Example4:39
 Speed and Velocity8:57
 Speed and Velocity: Definition & Formulas8:58
 Speed and Velocity: Example10:06
 Speed from Velocity12:01
 Speed from Velocity12:02
 Acceleration14:09
 Acceleration14:10
 Gravity14:26
 Gravity14:27
 Formulas15:11
 Formulas with Vectors15:12
 Example 1: Average Acceleration16:57
 Example 2A: Initial Velocity19:14
 Example 2B: How Long Does It Take for the Ball to Hit the Ground?21:35
 Example 2C: Displacement26:46
Frames of Reference
18m 36s
 Intro0:00
 Fundamental Example0:25
 Fundamental Example Part 10:26
 Fundamental Example Part 21:20
 General Case2:36
 Particle P and Two Observers A and B2:37
 Speed of P from A's Frame of Reference3:05
 What About Acceleration?3:22
 Acceleration Shows the Change in Velocity3:23
 Acceleration when Velocity is Constant3:48
 MultiDimensional Case4:35
 MultiDimensional Case4:36
 Some Notes5:04
 Choosing the Frame of Reference5:05
 Example 1: What Velocity does the Ball have from the Frame of Reference of a Stationary Observer?7:27
 Example 2: Velocity, Speed, and Displacement9:26
 Example 3: Speed and Acceleration in the Reference Frame12:44
Uniform Circular Motion
16m 34s
 Intro0:00
 Centripetal Acceleration1:21
 Centripetal Acceleration of a Rock Being Twirled Around on a String1:22
 Looking Closer: Instantaneous Velocity and Tangential Velocity2:35
 Magnitude of Acceleration3:55
 Centripetal Acceleration Formula5:14
 You Say You Want a Revolution6:11
 What is a Revolution?6:12
 How Long Does it Take to Complete One Revolution Around the Circle?6:51
 Example 1: Centripetal Acceleration of a Rock7:40
 Example 2: Magnitude of a Car's Acceleration While Turning9:20
 Example 3: Speed of a Point on the Edge of a US Quarter13:10
II. Force
Newton's 1st Law
12m 37s
 Intro0:00
 Newton's First Law/ Law of Inertia2:45
 A Body's Velocity Remains Constant Unless Acted Upon by a Force2:46
 Mass & Inertia4:07
 Mass & Inertia4:08
 Mass & Volume5:49
 Mass & Volume5:50
 Mass & Weight7:08
 Mass & Weight7:09
 Example 1: The Speed of a Rocket8:47
 Example 2: Which of the Following Has More Inertia?10:06
 Example 3: Change in Inertia11:51
Newton's 2nd Law: Introduction
27m 5s
 Intro0:00
 Net Force1:42
 Consider a Block That is Pushed On Equally From Both Sides1:43
 What if One of the Forces was Greater Than the Other?2:29
 The Net Force is All the Forces Put Together2:43
 Newton's Second Law3:14
 Net Force = (Mass) x (Acceleration)3:15
 Units3:48
 The Units of Newton's Second Law3:49
 FreeBody Diagram5:34
 FreeBody Diagram5:35
 Special Forces: Gravity (Weight)8:05
 Force of Gravity8:06
 Special Forces: Normal Force9:22
 Normal Force9:23
 Special Forces: Tension10:34
 Tension10:35
 Example 1: Force and Acceleration12:19
 Example 2: A 5kg Block is Pushed by Five Forces13:24
 Example 3: A 10kg Block Resting On a Table is Tethered Over a Pulley to a FreeHanging 2kg Block16:30
Newton's 2nd Law: Multiple Dimensions
27m 47s
 Intro0:00
 Newton's 2nd Law in Multiple Dimensions0:12
 Newton's 2nd Law in Multiple Dimensions0:13
 Components0:52
 Components0:53
 Example: Force in Component Form1:02
 Special Forces2:39
 Review of Special Forces: Gravity, Normal Force, and Tension2:40
 Normal Forces3:35
 Why Do We Call It the Normal Forces?3:36
 Normal Forces on a Flat Horizontal and Vertical Surface5:00
 Normal Forces on an Incline6:05
 Example 1: A 5kg Block is Pushed By a Force of 3N to the North and a Force of 4N to the East10:22
 Example 2: A 20kg Block is On an Incline of 50° With a Rope Holding It In Place16:08
 Example 3: A 10kg Block is On an Incline of 20° Attached By Rope to a Freehanging Block of 5kg20:50
Newton's 2nd Law: Advanced Examples
42m 5s
 Intro0:00
 Block and Tackle Pulley System0:30
 A Single Pulley Lifting System0:31
 A Double Pulley Lifting System1:32
 A Quadruple Pulley Lifting System2:59
 Example 1: A Freehanging, Massless String is Holding Up Three Objects of Unknown Mass4:40
 Example 2: An Object is Acted Upon by Three Forces10:23
 Example 3: A Chandelier is Suspended by a Cable From the Roof of an Elevator17:13
 Example 4: A 20kg Baboon Climbs a Massless Rope That is Attached to a 22kg Crate23:46
 Example 5: Two Blocks are Roped Together on Inclines of Different Angles33:17
Newton's Third Law
16m 47s
 Intro0:00
 Newton's Third Law0:50
 Newton's Third Law0:51
 Everyday Examples1:24
 Hammer Hitting a Nail1:25
 Swimming2:08
 Car Driving2:35
 Walking3:15
 Note3:57
 Newton's Third Law Sometimes Doesn't Come Into Play When Solving Problems: Reason 13:58
 Newton's Third Law Sometimes Doesn't Come Into Play When Solving Problems: Reason 25:36
 Example 1: What Force Does the Moon Pull on Earth?7:04
 Example 2: An Astronaut in Deep Space Throwing a Wrench8:38
 Example 3: A Woman Sitting in a Bosun's Chair that is Hanging from a Rope that Runs Over a Frictionless Pulley12:51
Friction
50m 11s
 Intro0:00
 Introduction0:04
 Our Intuition  Materials0:30
 Our Intuition  Weight2:48
 Our Intuition  Normal Force3:45
 The Normal Force and Friction4:11
 Two Scenarios: Same Object, Same Surface, Different Orientations4:12
 Friction is Not About Weight6:36
 Friction as an Equation7:23
 Summing Up Friction7:24
 Friction as an Equation7:36
 The Direction of Friction10:33
 The Direction of Friction10:34
 A Quick Example11:16
 Which Block Will Accelerate Faster?11:17
 Static vs. Kinetic14:52
 Static vs. Kinetic14:53
 Static and Kinetic Coefficient of Friction16:31
 How to Use Static Friction17:40
 How to Use Static Friction17:41
 Some Examples of μs and μk19:51
 Some Examples of μs and μk19:52
 A Remark on Wheels22:19
 A Remark on Wheels22:20
 Example 1: Calculating μs and μk28:02
 Example 2: At What Angle Does the Block Begin to Slide?31:35
 Example 3: A Block is Against a Wall, Sliding Down36:30
 Example 4: Two Blocks Sitting Atop Each Other40:16
Force & Uniform Circular Motion
26m 45s
 Intro0:00
 Centripetal Force0:46
 Equations for Centripetal Force0:47
 Centripetal Force in Action1:26
 Where Does Centripetal Force Come From?2:39
 Where Does Centripetal Force Come From?2:40
 Centrifugal Force4:05
 Centrifugal Force Part 14:06
 Centrifugal Force Part 26:16
 Example 1: Part A  Centripetal Force On the Car8:12
 Example 1: Part B  Maximum Speed the Car Can Take the Turn At Without Slipping8:56
 Example 2: A Bucket Full of Water is Spun Around in a Vertical Circle15:13
 Example 3: A Rock is Spun Around in a Vertical Circle21:36
III. Energy
Work
28m 34s
 Intro0:00
 Equivocation0:05
 Equivocation0:06
 Introduction to Work0:32
 Scenarios: 10kg Block on a Frictionless Table0:33
 Scenario: 2 Block of Different Masses2:52
 Work4:12
 Work and Force4:13
 Paralleled vs. Perpendicular4:46
 Work: A Formal Definition7:33
 An Alternate Formula9:00
 An Alternate Formula9:01
 Units10:40
 Unit for Work: Joule (J)10:41
 Example 1: Calculating Work of Force11:32
 Example 2: Work and the Force of Gravity12:48
 Example 3: A Moving Box & Force Pushing in the Opposite Direction15:11
 Example 4: Work and Forces with Directions18:06
 Example 5: Work and the Force of Gravity23:16
Energy: Kinetic
39m 7s
 Intro0:00
 Types of Energy0:04
 Types of Energy0:05
 Conservation of Energy1:12
 Conservation of Energy1:13
 What is Energy?4:23
 Energy4:24
 What is Work?5:01
 Work5:02
 Circular Definition, Much?5:46
 Circular Definition, Much?5:47
 Derivation of Kinetic Energy (Simplified)7:44
 Simplified Picture of Work7:45
 Consider the Following Three Formulas8:42
 Kinetic Energy Formula11:01
 Kinetic Energy Formula11:02
 Units11:54
 Units for Kinetic Energy11:55
 Conservation of Energy13:24
 Energy Cannot be Made or Destroyed, Only Transferred13:25
 Friction15:02
 How Does Friction Work?15:03
 Example 1: Velocity of a Block15:59
 Example 2: Energy Released During a Collision18:28
 Example 3: Speed of a Block22:22
 Example 4: Speed and Position of a Block26:22
Energy: Gravitational Potential
28m 10s
 Intro0:00
 Why Is It Called Potential Energy?0:21
 Why Is It Called Potential Energy?0:22
 Introduction to Gravitational Potential Energy1:20
 Consider an Object Dropped from EverIncreasing heights1:21
 Gravitational Potential Energy2:02
 Gravitational Potential Energy: Derivation2:03
 Gravitational Potential Energy: Formulas2:52
 Gravitational Potential Energy: Notes3:48
 Conservation of Energy5:50
 Conservation of Energy and Formula5:51
 Example 1: Speed of a Falling Rock6:31
 Example 2: Energy Lost to Air Drag10:58
 Example 3: Distance of a Sliding Block15:51
 Example 4: Swinging Acrobat21:32
Energy: Elastic Potential
44m 16s
 Intro0:00
 Introduction to Elastic Potential0:12
 Elastic Object0:13
 Spring Example1:11
 Hooke's Law3:27
 Hooke's Law3:28
 Example of Hooke's Law5:14
 Elastic Potential Energy Formula8:27
 Elastic Potential Energy Formula8:28
 Conservation of Energy10:17
 Conservation of Energy10:18
 You Ain't Seen Nothin' Yet12:12
 You Ain't Seen Nothin' Yet12:13
 Example 1: SpringLauncher13:10
 Example 2: Compressed Spring18:34
 Example 3: A Block Dangling From a Massless Spring24:33
 Example 4: Finding the Spring Constant36:13
Power & Simple Machines
28m 54s
 Intro0:00
 Introduction to Power & Simple Machines0:06
 What's the Difference Between a GoKart, a Family Van, and a Racecar?0:07
 Consider the Idea of Climbing a Flight of Stairs1:13
 Power2:35
 P= W / t2:36
 Alternate Formulas2:59
 Alternate Formulas3:00
 Units4:24
 Units for Power: Watt, Horsepower, and Kilowatthour4:25
 Block and Tackle, Redux5:29
 Block and Tackle Systems5:30
 Machines in General9:44
 Levers9:45
 Ramps10:51
 Example 1: Power of Force12:22
 Example 2: Power &Lifting a Watermelon14:21
 Example 3: Work and Instantaneous Power16:05
 Example 4: Power and Acceleration of a Race car25:56
IV. Momentum
Center of Mass
36m 55s
 Intro0:00
 Introduction to Center of Mass0:04
 Consider a Ball Tossed in the Air0:05
 Center of Mass1:27
 Definition of Center of Mass1:28
 Example of center of Mass2:13
 Center of Mass: Derivation4:21
 Center of Mass: Formula6:44
 Center of Mass: Formula, Multiple Dimensions8:15
 Center of Mass: Symmetry9:07
 Center of Mass: NonHomogeneous11:00
 Center of Gravity12:09
 Center of Mass vs. Center of Gravity12:10
 Newton's Second Law and the Center of Mass14:35
 Newton's Second Law and the Center of Mass14:36
 Example 1: Finding The Center of Mass16:29
 Example 2: Finding The Center of Mass18:55
 Example 3: Finding The Center of Mass21:46
 Example 4: A Boy and His Mail28:31
Linear Momentum
22m 50s
 Intro0:00
 Introduction to Linear Momentum0:04
 Linear Momentum Overview0:05
 Consider the Scenarios0:45
 Linear Momentum1:45
 Definition of Linear Momentum1:46
 Impulse3:10
 Impulse3:11
 Relationship Between Impulse & Momentum4:27
 Relationship Between Impulse & Momentum4:28
 Why is It Linear Momentum?6:55
 Why is It Linear Momentum?6:56
 Example 1: Momentum of a Skateboard8:25
 Example 2: Impulse and Final Velocity8:57
 Example 3: Change in Linear Momentum and magnitude of the Impulse13:53
 Example 4: A Ball of Putty17:07
Collisions & Linear Momentum
40m 55s
 Intro0:00
 Investigating Collisions0:45
 Momentum0:46
 Center of Mass1:26
 Derivation1:56
 Extending Idea of Momentum to a System1:57
 Impulse5:10
 Conservation of Linear Momentum6:14
 Conservation of Linear Momentum6:15
 Conservation and External Forces7:56
 Conservation and External Forces7:57
 Momentum Vs. Energy9:52
 Momentum Vs. Energy9:53
 Types of Collisions12:33
 Elastic12:34
 Inelastic12:54
 Completely Inelastic13:24
 Everyday Collisions and Atomic Collisions13:42
 Example 1: Impact of Two Cars14:07
 Example 2: Billiard Balls16:59
 Example 3: Elastic Collision23:52
 Example 4: Bullet's Velocity33:35
V. Gravity
Gravity & Orbits
34m 53s
 Intro0:00
 Law of Universal Gravitation1:39
 Law of Universal Gravitation1:40
 Force of Gravity Equation2:14
 Gravitational Field5:38
 Gravitational Field Overview5:39
 Gravitational Field Equation6:32
 Orbits9:25
 Orbits9:26
 The 'Falling' Moon12:58
 The 'Falling' Moon12:59
 Example 1: Force of Gravity17:05
 Example 2: Gravitational Field on the Surface of Earth20:35
 Example 3: Orbits23:15
 Example 4: Neutron Star28:38
VI. Waves
Intro to Waves
35m 35s
 Intro0:00
 Pulse1:00
 Introduction to Pulse1:01
 Wave1:59
 Wave Overview2:00
 Wave Types3:16
 Mechanical Waves3:17
 Electromagnetic Waves4:01
 Matter or Quantum Mechanical Waves4:43
 Transverse Waves5:12
 Longitudinal Waves6:24
 Wave Characteristics7:24
 Amplitude and Wavelength7:25
 Wave Speed (v)10:13
 Period (T)11:02
 Frequency (f)12:33
 v = λf14:51
 Wave Equation16:15
 Wave Equation16:16
 Angular Wave Number17:34
 Angular Frequency19:36
 Example 1: CPU Frequency24:35
 Example 2: Speed of Light, Wavelength, and Frequency26:11
 Example 3: Spacing of Grooves28:35
 Example 4: Wave Diagram31:21
Waves, Cont.
52m 57s
 Intro0:00
 Superposition0:38
 Superposition0:39
 Interference1:31
 Interference1:32
 Visual Example: Two Positive Pulses2:33
 Visual Example: Wave4:02
 Phase of Cycle6:25
 Phase Shift7:31
 Phase Shift7:32
 Standing Waves9:59
 Introduction to Standing Waves10:00
 Visual Examples: Standing Waves, Node, and Antinode11:27
 Standing Waves and Wavelengths15:37
 Standing Waves and Resonant Frequency19:18
 Doppler Effect20:36
 When Emitter and Receiver are Still20:37
 When Emitter is Moving Towards You22:31
 When Emitter is Moving Away24:12
 Doppler Effect: Formula25:58
 Example 1: Superposed Waves30:00
 Example 2: Superposed and Fully Destructive Interference35:57
 Example 3: Standing Waves on a String40:45
 Example 4: Police Siren43:26
 Example Sounds: 800 Hz, 906.7 Hz, 715.8 Hz, and Slide 906.7 to 715.8 Hz48:49
Sound
36m 24s
 Intro0:00
 Speed of Sound1:26
 Speed of Sound1:27
 Pitch2:44
 High Pitch & Low Pitch2:45
 Normal Hearing3:45
 Infrasonic and Ultrasonic4:02
 Intensity4:54
 Intensity: I = P/A4:55
 Intensity of Sound as an Outwardly Radiating Sphere6:32
 Decibels9:09
 Human Threshold for Hearing9:10
 Decibel (dB)10:28
 Sound Level β11:53
 Loudness Examples13:44
 Loudness Examples13:45
 Beats15:41
 Beats & Frequency15:42
 Audio Examples of Beats17:04
 Sonic Boom20:21
 Sonic Boom20:22
 Example 1: Firework23:14
 Example 2: Intensity and Decibels24:48
 Example 3: Decibels28:24
 Example 4: Frequency of a Violin34:48
Light
19m 38s
 Intro0:00
 The Speed of Light0:31
 Speed of Light in a Vacuum0:32
 Unique Properties of Light1:20
 Lightspeed!3:24
 Lightyear3:25
 Medium4:34
 Light & Medium4:35
 Electromagnetic Spectrum5:49
 Electromagnetic Spectrum Overview5:50
 Electromagnetic Wave Classifications7:05
 Long Radio Waves & Radio Waves7:06
 Microwave8:30
 Infrared and Visible Spectrum9:02
 Ultraviolet, Xrays, and Gamma Rays9:33
 So Much Left to Explore11:07
 So Much Left to Explore11:08
 Example 1: How Much Distance is in a Lightyear?13:16
 Example 2: Electromagnetic Wave16:50
 Example 3: Radio Station & Wavelength17:55
VII. Thermodynamics
Fluids
42m 52s
 Intro0:00
 Fluid?0:48
 What Does It Mean to be a Fluid?0:49
 Density1:46
 What is Density?1:47
 Formula for Density: ρ = m/V2:25
 Pressure3:40
 Consider Two Equal Height Cylinders of Water with Different Areas3:41
 Definition and Formula for Pressure: p = F/A5:20
 Pressure at Depth7:02
 Pressure at Depth Overview7:03
 Free Body Diagram for Pressure in a Container of Fluid8:31
 Equations for Pressure at Depth10:29
 Absolute Pressure vs. Gauge Pressure12:31
 Absolute Pressure vs. Gauge Pressure12:32
 Why Does Gauge Pressure Matter?13:51
 Depth, Not Shape or Direction15:22
 Depth, Not Shape or Direction15:23
 Depth = Height18:27
 Depth = Height18:28
 Buoyancy19:44
 Buoyancy and the Buoyant Force19:45
 Archimedes' Principle21:09
 Archimedes' Principle21:10
 Wait! What About Pressure?22:30
 Wait! What About Pressure?22:31
 Example 1: Rock & Fluid23:47
 Example 2: Pressure of Water at the Top of the Reservoir28:01
 Example 3: Wood & Fluid31:47
 Example 4: Force of Air Inside a Cylinder36:20
Intro to Temperature & Heat
34m 6s
 Intro0:00
 Absolute Zero1:50
 Absolute Zero1:51
 Kelvin2:25
 Kelvin2:26
 Heat vs. Temperature4:21
 Heat vs. Temperature4:22
 Heating Water5:32
 Heating Water5:33
 Specific Heat7:44
 Specific Heat: Q = cm(∆T)7:45
 Heat Transfer9:20
 Conduction9:24
 Convection10:26
 Radiation11:35
 Example 1: Converting Temperature13:21
 Example 2: Calories14:54
 Example 3: Thermal Energy19:00
 Example 4: Temperature When Mixture Comes to Equilibrium Part 120:45
 Example 4: Temperature When Mixture Comes to Equilibrium Part 224:55
Change Due to Heat
44m 3s
 Intro0:00
 Linear Expansion1:06
 Linear Expansion: ∆L = Lα(∆T)1:07
 Volume Expansion2:34
 Volume Expansion: ∆V = Vβ(∆T)2:35
 Gas Expansion3:40
 Gas Expansion3:41
 The Mole5:43
 Conceptual Example5:44
 The Mole and Avogadro's Number7:30
 Ideal Gas Law9:22
 Ideal Gas Law: pV = nRT9:23
 p = Pressure of the Gas10:07
 V = Volume of the Gas10:34
 n = Number of Moles of Gas10:44
 R = Gas Constant10:58
 T = Temperature11:58
 A Note On Water12:21
 A Note On Water12:22
 Change of Phase15:55
 Change of Phase15:56
 Change of Phase and Pressure17:31
 Phase Diagram18:41
 Heat of Transformation20:38
 Heat of Transformation: Q = Lm20:39
 Example 1: Linear Expansion22:38
 Example 2: Explore Why β = 3α24:40
 Example 3: Ideal Gas Law31:38
 Example 4: Heat of Transformation38:03
Thermodynamics
27m 30s
 Intro0:00
 First Law of Thermodynamics1:11
 First Law of Thermodynamics1:12
 Engines2:25
 Conceptual Example: Consider a Piston2:26
 Second Law of Thermodynamics4:17
 Second Law of Thermodynamics4:18
 Entropy6:09
 Definition of Entropy6:10
 Conceptual Example of Entropy: Stick of Dynamite7:00
 Order to Disorder8:22
 Order and Disorder in a System8:23
 The Poets Got It Right10:20
 The Poets Got It Right10:21
 Engines in General11:21
 Engines in General11:22
 Efficiency12:06
 Measuring the Efficiency of a System12:07
 Carnot Engine ( A Limit to Efficiency)13:20
 Carnot Engine & Maximum Possible Efficiency13:21
 Example 1: Internal Energy15:15
 Example 2: Efficiency16:13
 Example 3: Second Law of Thermodynamics17:05
 Example 4: Maximum Efficiency20:10
VIII. Electricity
Electric Force & Charge
41m 35s
 Intro0:00
 Charge1:04
 Overview of Charge1:05
 Positive and Negative Charges1:19
 A Simple Model of the Atom2:47
 Protons, Electrons, and Neutrons2:48
 Conservation of Charge4:47
 Conservation of Charge4:48
 Elementary Charge5:41
 Elementary Charge and the Unit Coulomb5:42
 Coulomb's Law8:29
 Coulomb's Law & the Electrostatic Force8:30
 Coulomb's Law Breakdown9:30
 Conductors and Insulators11:11
 Conductors11:12
 Insulators12:31
 Conduction15:08
 Conduction15:09
 Conceptual Examples15:58
 Induction17:02
 Induction Overview17:01
 Conceptual Examples18:18
 Example 1: Electroscope20:08
 Example 2: Positive, Negative, and Net Charge of Iron22:15
 Example 3: Charge and Mass27:52
 Example 4: Two Metal Spheres31:58
Electric Fields & Potential
34m 44s
 Intro0:00
 Electric Fields0:53
 Electric Fields Overview0:54
 Size of q2 (Second Charge)1:34
 Size of q1 (First Charge)1:53
 Electric Field Strength: Newtons Per Coulomb2:55
 Electric Field Lines4:19
 Electric Field Lines4:20
 Conceptual Example 15:17
 Conceptual Example 26:20
 Conceptual Example 36:59
 Conceptual Example 47:28
 Faraday Cage8:47
 Introduction to Faraday Cage8:48
 Why Does It Work?9:33
 Electric Potential Energy11:40
 Electric Potential Energy11:41
 Electric Potential13:44
 Electric Potential13:45
 Difference Between Two States14:29
 Electric Potential is Measured in Volts15:12
 Ground Voltage16:09
 Potential Differences and Reference Voltage16:10
 Ground Voltage17:20
 Electronvolt19:17
 Electronvolt19:18
 Equipotential Surfaces20:29
 Equipotential Surfaces20:30
 Equipotential Lines21:21
 Equipotential Lines21:22
 Example 1: Electric Field22:40
 Example 2: Change in Energy24:25
 Example 3: Constant Electrical Field27:06
 Example 4: Electrical Field and Change in Voltage29:06
 Example 5: Voltage and Energy32:14
Electric Current
29m 12s
 Intro0:00
 Electric Current0:31
 Electric Current0:32
 Amperes1:27
 Moving Charge1:52
 Conceptual Example: Electric Field and a Conductor1:53
 Voltage3:26
 Resistance5:05
 Given Some Voltage, How Much Current Will Flow?5:06
 Resistance: Definition and Formula5:40
 Resistivity7:31
 Resistivity7:32
 Resistance for a Uniform Object9:31
 Energy and Power9:55
 How Much Energy Does It take to Move These Charges Around?9:56
 What Do We Call Energy Per Unit Time?11:08
 Formulas to Express Electrical Power11:53
 Voltage Source13:38
 Introduction to Voltage Source13:39
 Obtaining a Voltage Source: Generator15:15
 Obtaining a Voltage Source: Battery16:19
 Speed of Electricity17:17
 Speed of Electricity17:18
 Example 1: Electric Current & Moving Charge19:40
 Example 2: Electric Current & Resistance20:31
 Example 3: Resistivity & Resistance21:56
 Example 4: Light Bulb25:16
Electric Circuits
52m 2s
 Intro0:00
 Electric Circuits0:51
 Current, Voltage, and Circuit0:52
 Resistor5:05
 Definition of Resistor5:06
 Conceptual Example: Lamps6:18
 Other Fundamental Components7:04
 Circuit Diagrams7:23
 Introduction to Circuit Diagrams7:24
 Wire7:42
 Resistor8:20
 Battery8:45
 Power Supply9:41
 Switch10:02
 Wires: Bypass and Connect10:53
 A Special Not in General12:04
 Example: Simple vs. Complex Circuit Diagram12:45
 Kirchoff's Circuit Laws15:32
 Kirchoff's Circuit Law 1: Current Law15:33
 Kirchoff's Circuit Law 1: Visual Example16:57
 Kirchoff's Circuit Law 2: Voltage Law17:16
 Kirchoff's Circuit Law 2: Visual Example19:23
 Resistors in Series21:48
 Resistors in Series21:49
 Resistors in Parallel23:33
 Resistors in Parallel23:34
 Voltmeter and Ammeter28:35
 Voltmeter28:36
 Ammeter30:05
 Direct Current vs. Alternating Current31:24
 Direct Current vs. Alternating Current31:25
 Visual Example: Voltage Graphs33:29
 Example 1: What Voltage is Read by the Voltmeter in This Diagram?33:57
 Example 2: What Current Flows Through the Ammeter When the Switch is Open?37:42
 Example 3: How Much Power is Dissipated by the Highlighted Resistor When the Switch is Open? When Closed?41:22
 Example 4: Design a Hallway Light Switch45:14
IX. Magnetism
Magnetism
25m 47s
 Intro0:00
 Magnet1:27
 Magnet Has Two Poles1:28
 Magnetic Field1:47
 Always a Dipole, Never a Monopole2:22
 Always a Dipole, Never a Monopole2:23
 Magnetic Fields and Moving Charge4:01
 Magnetic Fields and Moving Charge4:02
 Magnets on an Atomic Level4:45
 Magnets on an Atomic Level4:46
 Evenly Distributed Motions5:45
 Unevenly Distributed Motions6:22
 Current and Magnetic Fields9:42
 Current Flow and Magnetic Field9:43
 Electromagnet11:35
 Electric Motor13:11
 Electric Motor13:12
 Generator15:38
 A Changing Magnetic Field Induces a Current15:39
 Example 1: What Kind of Magnetic Pole must the Earth's Geographic North Pole Be?19:34
 Example 2: Magnetic Field and Generator/Electric Motor20:56
 Example 3: Destroying the Magnetic Properties of a Permanent Magnet23:08
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For more information, please see full course syllabus of High School Physics
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1 answer
Last reply by: Professor SelhorstJones
Mon Dec 10, 2012 1:23 PM
Post by Abdelrahman Megahed on November 30, 2012
Example 4:
How come when you use other method not COE you end up with 7.4s?