# Online courses directory (81)

Videos attempting to grasp a little bit about our Universe (many of the topics associated with "Big History"). Scale of Earth and Sun. Scale of Solar System. Scale of Distance to Closest Stars. Scale of the Galaxy. Intergalactic Scale. Hubble Image of Galaxies. Big Bang Introduction. Radius of Observable Universe. (Correction) Radius of Observable Universe. Red Shift. Cosmic Background Radiation. Cosmic Background Radiation 2. Cosmological Time Scale 1. Cosmological Time Scale 2. Four Fundamental Forces. Birth of Stars. Becoming a Red Giant. White and Black Dwarfs. A Universe Smaller than the Observable. Star Field and Nebula Images. Parallax in Observing Stars. Stellar Parallax. Stellar Distance Using Parallax. Stellar Parallax Clarification. Parsec Definition. Hubble's Law. Lifecycle of Massive Stars. Supernova (Supernovae). Supernova clarification. Black Holes. Cepheid Variables 1. Why Cepheids Pulsate. Why Gravity Gets So Strong Near Dense Objects. Supermassive Black Holes. Quasars. Quasar Correction. Galactic Collisions. Earth Formation. Beginnings of Life. Ozone Layer and Eukaryotes Show Up in the Proterozoic Eon. Biodiversity Flourishes in Phanerozoic Eon. First living things on land clarification. Plate Tectonics-- Difference between crust and lithosphere. Structure of the Earth. Plate Tectonics -- Evidence of plate movement. Plate Tectonics -- Geological Features of Divergent Plate Boundaries. Plate Tectonics-- Geological features of Convergent Plate Boundaries. Plates Moving Due to Convection in Mantle. Hawaiian Islands Formation. Compositional and Mechanical Layers of the Earth. Seismic Waves. Why S-Waves Only Travel in Solids. Refraction of Seismic Waves. The Mohorovicic Seismic Discontinuity. How we know about the Earth's core. Pangaea. Scale of the Large. Scale of the Small. Detectable Civilizations in our Galaxy 1. Detectable Civilizations in our Galaxy 2. Detectable Civilizations in our Galaxy 3. Detectable Civilizations in our Galaxy 4. Detectable Civilizations in our Galaxy 5. Human Evolution Overview. Understanding Calendar Notation. Correction Calendar Notation. Development of Agriculture and Writing. Introduction to Light. Seasons Aren't Dictated by Closeness to Sun. How Earth's Tilt Causes Seasons. Milankovitch Cycles Precession and Obliquity. Are Southern Hemisphere Seasons More Severe?. Precession Causing Perihelion to Happen Later. What Causes Precession and Other Orbital Changes. Apsidal Precession (Perihelion Precession) and Milankovitch Cycles. Firestick Farming. Carbon 14 Dating 1. Carbon 14 Dating 2. Potassium-Argon (K-Ar) Dating. K-Ar Dating Calculation. Chronometric Revolution. Collective Learning. Land Productivity Limiting Human Population. Energy Inputs for Tilling a Hectare of Land. Random Predictions for 2060.

Electrostatics (part 1): Introduction to Charge and Coulomb's Law. Electrostatics (part 2). Proof (Advanced): Field from infinite plate (part 1). Proof (Advanced): Field from infinite plate (part 2). Electric Potential Energy. Electric Potential Energy (part 2-- involves calculus). Voltage. Capacitance. Circuits (part 1). Circuits (part 2). Circuits (part 3). Circuits (part 4). Cross product 1. Cross Product 2. Cross Product and Torque. Introduction to Magnetism. Magnetism 2. Magnetism 3. Magnetism 4. Magnetism 5. Magnetism 6: Magnetic field due to current. Magnetism 7. Magnetism 8. Magnetism 9: Electric Motors. Magnetism 10: Electric Motors. Magnetism 11: Electric Motors. Magnetism 12: Induced Current in a Wire. The dot product. Dot vs. Cross Product. Calculating dot and cross products with unit vector notation. Electrostatics (part 1): Introduction to Charge and Coulomb's Law. Electrostatics (part 2). Proof (Advanced): Field from infinite plate (part 1). Proof (Advanced): Field from infinite plate (part 2). Electric Potential Energy. Electric Potential Energy (part 2-- involves calculus). Voltage. Capacitance. Circuits (part 1). Circuits (part 2). Circuits (part 3). Circuits (part 4). Cross product 1. Cross Product 2. Cross Product and Torque. Introduction to Magnetism. Magnetism 2. Magnetism 3. Magnetism 4. Magnetism 5. Magnetism 6: Magnetic field due to current. Magnetism 7. Magnetism 8. Magnetism 9: Electric Motors. Magnetism 10: Electric Motors. Magnetism 11: Electric Motors. Magnetism 12: Induced Current in a Wire. The dot product. Dot vs. Cross Product. Calculating dot and cross products with unit vector notation.

Fluids (part 1). Fluids (part 2). Fluids (part 3). Fluids (part 4). Fluids (part 5). Fluids (part 6). Fluids (part 7). Fluids (part 8). Fluids (part 9). Fluids (part 10). Fluids (part 11). Fluids (part 12). Fluids (part 1). Fluids (part 2). Fluids (part 3). Fluids (part 4). Fluids (part 5). Fluids (part 6). Fluids (part 7). Fluids (part 8). Fluids (part 9). Fluids (part 10). Fluids (part 11). Fluids (part 12).

This free online tutorial reviews motion, electric fields, spectra, energy transfers, force, acceleration, gravity Newton's Laws, projectiles, light, and much, much more. This comprehensive grounding in Physics is ideal as a complement to regular classes, as a study and revision aid, and as a resource for someone pursuing an interest in basic science.

This free online Physics course covers electronics, electric systems, magnets, sounds and transformers, and much more. It provides a comprehensive grounding in Physics and is ideal as a complement to regular classes, a study or revision aid, or as a resource for someone pursuing an interest in basic science.

Relationship between angular velocity and speed. Why Distance is Area under Velocity-Time Line. Introduction to Vectors and Scalars. Calculating Average Velocity or Speed. Solving for Time. Displacement from Time and Velocity Example. Acceleration. Balanced and Unbalanced Forces. Unbalanced Forces and Motion. Newton's First Law of Motion. Newton's First Law of Motion Concepts. Newton's First Law of Motion. Newton's Second Law of Motion. Newton's Third Law of Motion. Airbus A380 Take-off Time. Airbus A380 Take-off Distance. Average Velocity for Constant Acceleration. Acceleration of Aircraft Carrier Takeoff. Race Cars with Constant Speed Around Curve. Introduction to Gravity. Mass and Weight Clarification. Gravity for Astronauts in Orbit. Would a Brick or Feather Fall Faster. Deriving Displacement as a Function of Time, Acceleration and Initial Velocity. Plotting Projectile Displacement, Acceleration, and Velocity. Projectile Height Given Time. Deriving Max Projectile Displacement Given Time. Impact Velocity From Given Height. Visualizing Vectors in 2 Dimensions. Projectile at an Angle. Different Way to Determine Time in Air. Launching and Landing on Different Elevations. Total Displacement for Projectile. Total Final Velocity for Projectile. Correction to Total Final Velocity for Projectile. Projectile on an Incline. Unit Vectors and Engineering Notation. Clearing the Green Monster at Fenway. Green Monster at Fenway Part 2. Optimal angle for a projectile part 1. Optimal angle for a projectile part 2 - Hangtime. Optimal angle for a projectile part 3 - Horizontal distance as a function of angle (and speed). Optimal angle for a projectile part 4 Finding the optimal angle and distance with a bit of calculus. Slow Sock on Lubricon VI. Normal Forces on Lubricon VI. Normal Force and Contact Force. Normal Force in an Elevator. Inclined Plane Force Components. Ice Accelerating Down an Incline. Force of Friction Keeping the Block Stationary. Correction to Force of Friction Keeping the Block Stationary. Force of Friction Keeping Velocity Constant. Intuition on Static and Kinetic Friction Comparisons. Static and Kinetic Friction Example. Introduction to Tension. Introduction to Tension (Part 2). Tension in an accelerating system and pie in the face. Introduction to Momentum. Momentum: Ice skater throws a ball. 2-dimensional momentum problem. 2-dimensional momentum problem (part 2). Introduction to work and energy. Work and Energy (part 2). Conservation of Energy. Work/Energy problem with Friction. Introduction to mechanical advantage. Mechanical Advantage (part 2). Mechanical Advantage (part 3). Center of Mass. Introduction to Torque. Moments. Moments (part 2). Unit Vector Notation. Unit Vector Notation (part 2). Projectile Motion with Ordered Set Notation. Projectile motion (part 1). Projectile motion (part 2). Projectile motion (part 3). Projectile motion (part 4). Projectile motion (part 5). Centripetal Force and Acceleration Intuition. Visual Understanding of Centripetal Acceleration Formula. Calculus proof of centripetal acceleration formula. Loop De Loop Question. Loop De Loop Answer part 1. Loop De Loop Answer part 2. Acceleration Due to Gravity at the Space Station. Space Station Speed in Orbit. Conservation of angular momentum. Introduction to Newton's Law of Gravitation. Gravitation (part 2). Viewing g as the value of Earth's Gravitational Field Near the Surface. Intro to springs and Hooke's Law. Potential energy stored in a spring. Spring potential energy example (mistake in math). Introduction to Harmonic Motion. Harmonic Motion Part 2 (calculus). Harmonic Motion Part 3 (no calculus).

Thermodynamics (part 1). Thermodynamics (part 2). Thermodynamics (part 3). Thermodynamics (part 4). Thermodynamics (part 5). Macrostates and Microstates. Quasistatic and Reversible Processes. First Law of Thermodynamics/ Internal Energy. More on Internal Energy. Work from Expansion. PV-diagrams and Expansion Work. Proof: U=(3/2)PV or U=(3/2)nRT. Work Done by Isothermic Process. Carnot Cycle and Carnot Engine. Proof: Volume Ratios in a Carnot Cycle. Proof: S (or Entropy) is a valid state variable. Thermodynamic Entropy Definition Clarification. Reconciling Thermodynamic and State Definitions of Entropy. Entropy Intuition. Maxwell's Demon. More on Entropy. Efficiency of a Carnot Engine. Carnot Efficiency 2: Reversing the Cycle. Carnot Efficiency 3: Proving that it is the most efficient. Enthalpy. Heat of Formation. Hess's Law and Reaction Enthalpy Change. Gibbs Free Energy and Spontaneity. Gibbs Free Energy Example. More rigorous Gibbs Free Energy/ Spontaneity Relationship. A look at a seductive but wrong Gibbs/Spontaneity Proof. Stoichiometry Example Problem 1. Stoichiometry Example Problem 2. Limiting Reactant Example Problem 1. Empirical and Molecular Formulas from Stoichiometry. Example of Finding Reactant Empirical Formula. Stoichiometry of a Reaction in Solution. Another Stoichiometry Example in a Solution. Molecular and Empirical Forumlas from Percent Composition. Hess's Law Example. Thermodynamics (part 1). Thermodynamics (part 2). Thermodynamics (part 3). Thermodynamics (part 4). Thermodynamics (part 5). Macrostates and Microstates. Quasistatic and Reversible Processes. First Law of Thermodynamics/ Internal Energy. More on Internal Energy. Work from Expansion. PV-diagrams and Expansion Work. Proof: U=(3/2)PV or U=(3/2)nRT. Work Done by Isothermic Process. Carnot Cycle and Carnot Engine. Proof: Volume Ratios in a Carnot Cycle. Proof: S (or Entropy) is a valid state variable. Thermodynamic Entropy Definition Clarification. Reconciling Thermodynamic and State Definitions of Entropy. Entropy Intuition. Maxwell's Demon. More on Entropy. Efficiency of a Carnot Engine. Carnot Efficiency 2: Reversing the Cycle. Carnot Efficiency 3: Proving that it is the most efficient. Enthalpy. Heat of Formation. Hess's Law and Reaction Enthalpy Change. Gibbs Free Energy and Spontaneity. Gibbs Free Energy Example. More rigorous Gibbs Free Energy/ Spontaneity Relationship. A look at a seductive but wrong Gibbs/Spontaneity Proof. Stoichiometry Example Problem 1. Stoichiometry Example Problem 2. Limiting Reactant Example Problem 1. Empirical and Molecular Formulas from Stoichiometry. Example of Finding Reactant Empirical Formula. Stoichiometry of a Reaction in Solution. Another Stoichiometry Example in a Solution. Molecular and Empirical Forumlas from Percent Composition. Hess's Law Example.

Physics 140 offers introduction to mechanics, the physics of motion. Topics include: linear motion, vectors, projectiles, relative velocity and acceleration, Newton's laws, particle dynamics, work and energy, linear momentum, torque, angular momentum, gravitation, planetary motion, fluid statics and dynamics, simple harmonic motion, waves and sound. Course Level: Undergraduate This Work, Physics 140 - General Physics 1, by Gus Evrard is licensed under a Creative Commons Attribution license.

Introduction to Waves. Amplitude, Period, Frequency and Wavelength of Periodic Waves. Introduction to the Doppler Effect. Doppler effect formula when source is moving away. When the source and the wave move at the same velocity. Mach Numbers. Specular and Diffuse Reflection. Specular and Diffuse Reflection 2. Refraction and Snell's Law. Refraction in Water. Snell's Law Example 1. Snell's Law Example 2. Total Internal Reflection. Virtual Image. Parabolic Mirrors and Real Images. Parabolic Mirrors 2. Convex Parabolic Mirrors. Convex Lenses. Convex Lens Examples. Doppler effect formula for observed frequency. Concave Lenses. Object Image and Focal Distance Relationship (Proof of Formula). Object Image Height and Distance Relationship. Introduction to Waves. Amplitude, Period, Frequency and Wavelength of Periodic Waves. Introduction to the Doppler Effect. Doppler effect formula when source is moving away. When the source and the wave move at the same velocity. Mach Numbers. Specular and Diffuse Reflection. Specular and Diffuse Reflection 2. Refraction and Snell's Law. Refraction in Water. Snell's Law Example 1. Snell's Law Example 2. Total Internal Reflection. Virtual Image. Parabolic Mirrors and Real Images. Parabolic Mirrors 2. Convex Parabolic Mirrors. Convex Lenses. Convex Lens Examples. Doppler effect formula for observed frequency. Concave Lenses. Object Image and Focal Distance Relationship (Proof of Formula). Object Image Height and Distance Relationship.

Matter exists in four states - solid, liquid, gas and plasma and it will change state depending on the temperature and pressure applied to the matter. In this free online chemistry course about states of matter you will learn about the characteristics of each of the four states and the amount of energy that can be added to or taken from a substance before it starts to change state. As all substances change state at different temperatures and pressures you will learn how to use phase change diagrams to plot the energy and pressure levels, the triple point, critical temperature, boiling and melting points associated with different substances. You will also learn in a step by step manner how to calculate the change in energy needed to move a substance along the state of matter spectrum. This free online chemistry course will be of great interest to all students who wish to pursue a career in any of the sciences such as chemistry, physics, biology or geology, or the individual learner who simply wants to learn and understand what is happening when matter changes from solid to liquid to gas.<br />

The free online Diploma in General Science course from ALISON is ideal for anyone who wants to gain a comprehensive knowledge and understanding of key subjects in biology, chemistry and physics. In biology you will covers subjects such as cell theory, genetics and evolution; in chemistry you will cover subjects such as atoms, molecules and the periodic table; and in physics you will cover subjects such as magnetism, electricity and sound. This Diploma course will be of great interest to those who want to further improve their knowledge and understanding of general science, and will greatly enhance your career prospects.<br />

Using vectors to study motion is a fundamental skill to have when studying physics. Vector quantities used to describe the physical world include displacement, velocity, acceleration, and force. In this free online physics course the standard way to represent vectors and their axes as well as unit vector notation are explained in a clear and step-by-step manner. Examples show how to work out the angle or distance necessary to get the desired displacement. Using two known variables you will learn how to work through the process of calculating the remaining value, such as time in air or horizontal displacement using a variety of techniques. This free online physics course will be of great interest to students who are studying physics, chemistry, engineering, mathematics, and to students who wish to pursue a career in any of the sciences or engineering fields, and even the sportsperson who wants to plan for a specific outcome when hitting a golf ball or batting a ball.<br />

Watch fun, educational videos on all sorts of Physics questions. Bridge Design and Destruction! (part 1). Bridge Design (and Destruction!) Part 2. Shifts in Equilibrium. The Marangoni Effect: How to make a soap propelled boat!. The Invention of the Battery. The Forces on an Airplane. Bouncing Droplets: Superhydrophobic and Superhydrophilic Surfaces. A Crash Course on Indoor Flying Robots.

Gravity is the force that keeps us on the ground and understanding how gravity works is very important as it has a great influence on the upward and downward movement of objects. This free online course about gravity will explain Newtonâ€™s Second Law of Motion, the universal constant, which is used to work out the force of gravity throughout the universe. You will also learn what the effect of the earth's force of gravity, or little g as it is known, has on an object and why mass is not the same as weight. To fully understand gravity this course will take you step-by-step through the relevant formulas, showing you how to calculate velocity or distance based on time and then plot these changes so you will have a visual concept of what is happening. This course will be of great interest to students who are studying physics, chemistry, engineering, mathematics, and to students who wish to pursue a career in any of the sciences or engineering fields.<br />

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