First living things on land clarification (This video copyrighted under Create Commons Attribution and Share-Alike CC-BY-SA license). Created by Sal Khan.
The first term in a Fourier series is the average value (DC value) of the function being approximated. Created by Sal Khan.
Description of blood through the heart
See how energy flows and matter is recycled in ecosystems.
The fluid mosaic model describes the cell membrane as a tapestry of several types of molecules (phospholipids, cholesterols, and proteins) that are constantly moving. This movement helps the cell membrane maintain its role as a barrier between the inside and outside of the cell environments.
Introduction and intuition for flux and magnetic flux.
What happens if we change the distance between our aperture and image plane?
Foil Leaf Electroscope. Aluminum leaves repel in the presence of a charged object. Created by Brit Cruise.
An introduction to recursion in coding.
What's the different between a wind force and the force due to gravity? This video covers both Newton's second law of motion and law of gravity.
David explains how to use a force vs. time graph to find the change in momentum and solves an example problem to find the final velocity of a spaceship. Created by David SantoPietro.
An introduction to Gravity, Weak, Electromagnetic and Strong Forces. Created by Sal Khan.
The Fourier Series allows us to model any arbitrary periodic signal with a combination of sines and cosines. In this video sequence Sal works out the Fourier Series of a square wave. Created by Sal Khan.
Fourier coefficients for cosine terms. Created by Sal Khan.
Fourier coefficients for sine terms. Created by Sal Khan.
Sal draws a free body diagram for a box held stationary against a wall with a force at an angle theta.
Can you tell the difference between actions based upon flipping a coin and those based upon blind guessing or simulating randomness? This short video examines the frequency stability property. Created by Brit Cruise.
Meet John Resig, the developer that invented jQuery and now works as an engineer at Khan Academy.
Pamela shows how you can pass parameters into custom functions, so that they can behave differently each time you call them.
Pamela explains how to return values from functions, especially useful in doing calculations.