A simple conservation of momentum problem involving an ice skater and a ball. Created by Sal Khan.
An overview of other CSS text properties.
Pamela explains how to use mouseIsPressed with if statements to execute code only when the user is pressing their mouse.
Sophia shows how to use a while loop to draw multiple shapes in a row.
Using AND/OR in SQL queries.
A few more examples of exponential decay. Practice calculating k from half-life, and calculating initial mass. Created by Sal Khan.
Learn more techniques for processing forms with jQuery, like scoping attribute selectors.
David explains how to use Newton's second law when dealing with multiple forces, forces in two dimensions, and diagonal forces. Created by David SantoPietro.
David explains some of the common misconceptions in dealing with Newton's Third Law. He also shows how to correctly and reliably identify Third Law force pairs. Created by David SantoPietro.
Jessica Liu explains more important things you should know about using variables.
Clarification of, and more thoughts on, the Bernoulli's equation example problem where liquid exits a hole in a container. Created by Sal Khan.
See how there's actually constructive (rather than just destructive) interference at some points on the screen. Created by David SantoPietro.
Electric Telegraphs and developments leading to Morse Code. Created by Brit Cruise.
The use of motion in visual storytelling.
In this video we take you step by step through building the L298 Motor driver. This controller allows you to use your Arduino to control the hair dryer motors used to move the Bit-zee bot. Created by Karl Wendt.
In this video we show you how to attach and wire the L-298 motor controller board to Bit-zee's frame. Created by Karl Wendt.
Connecting motors to the controller. Created by Karl Wendt.
In this video we show you how to determine which wire is which and how to connect them to your Arduino. Created by Karl Wendt.
This video outlines in simple terms why a motor controller is needed and what it does. Created by Karl Wendt.
In this video we re-wire Bit-zee's motors to include longer wires and then we re-attach them to his frame. This video shows more detail than the previous motor video and it is shot in real time. This video also shows how to route the wires. Created by Karl Wendt.