In this video we hack apart a bread board to create a 5 volt power distribution strip. The 5 volts comes from the center pin in the motor controller and the negative or ground comes from the ground pin on the motor controller. Created by Karl Wendt.

Now we just need to determine whether our intersection point is inside or outside the triangle.

Let's put everything together. Get ready for a really powerful formula: the binomial coefficient (warning: you may need to watch this a few times!).

Time to get a little mathy. Let's look at the general form for any transformation.

Vicki Lombardi's 6th grade students at Santa Rita Elementary in Los Altos School district learn how to build a Spider robot. Read more at: http://lasdilearn.blogspot.com/2013/02/third-graders-building-robots-mission.html. Created by Karl Wendt.

Solving circuits with differential equations is hard. If we limit ourselves to sinusoidal input signals, a whole new method of AC analysis emerges. Created by Willy McAllister.

Here's a preview of how AC analysis is going to work. To get ready we need to review some of the ideas from trig and complex numbers. Created by Willy McAllister.

We break a sinusoidal input voltage into two complex exponentials. Using superposition, we can recover the complex output signals and reassemble them into a real sinusoidal output voltage. Created by Willy McAllister.

Overview of what the Alternative Minimum Tax is and its purpose. Created by Sal Khan.

In this video David quickly explains each charge and circuit concept and does a sample question for each one. Created by David SantoPietro.

In this video David rapidly explains all the concepts in 1D motion and also quickly solves a sample problem for each concept. Keep an eye on the side scroll see how far along you've made it in the review video. Created by David SantoPietro.

In this video David quickly explains each 2D motion concept and does a quick example problem for each concept. Keep an eye on the scroll to the right to see where you are in the review. Created by David SantoPietro.

In this video David explains each concept for centripetal motion and solves an example problem for each concept. Created by David SantoPietro.

In this video David explains the concepts in Work and Energy and does an example problem for each concept. Link for document: https://www.dropbox.com/s/t1w6xlnkozzel17/Energy%20review.pdf?dl=0. Created by David SantoPietro.

In this video David quickly explains each concept behind Forces and Newton's Laws and does a sample problem for each concept. Keep an eye on the scroll to the right to see how far along you've made it in the review. Created by David SantoPietro.

In this video, David quickly explains each torque and angular concept and does a sample question for each one. Created by David SantoPietro.

In this video David quickly explains each concept for waves and simple harmonic motion and does an example question for each one. Created by David SantoPietro.