A pencil causes a change in the deflection, similar to the effect of adding an electromagnet. Why? Created by Brit Cruise.
David explains how a pendulum can be treated as a simple harmonic oscillator, and then explains what affects, as well as what does not affect, the period of a pendulum. Created by David SantoPietro.
Understanding per capita population growth and exponential growth.
Claude Shannon's idea of perfect secrecy: no amount of computational power can help improve your ability to break the one-time pad. Created by Brit Cruise.
David explains what affects the period of a mass on a spring (i.e. mass and spring constant). He also explains what does not affect the period of a mass on a spring (i.e. amplitude and gravitational acceleration). Created by David SantoPietro.
Learn how the periodic table organizes the known elements of our world. Check out our videos and exercises on atomic structure and properties and periodic trends.
Explore how 2D curves can be added together to create more detailed patterns.
Explore how 3D curves can be added together to create 2D noise.
How homologous chromosomes separate into two sets. Prophase I, metaphase I, anaphase I, and telophase I.
How sister chromatids separate to form gametes. Prophase II, metaphase II, anaphase II, telophase II.
Understanding how the same genotype can still result in variation of phenotype based on environment.
Explaining the photoelectric effect using wave-particle duality, the work function of a metal, and how to calculate the velocity of a photoelectron. Created by Jay.
In this video, David explains what a photon is and how to determine the energy of a photon. Created by David SantoPietro.
In this video, David (and surfer Dan) explain how to determine the momentum of a photon.
Overview of photosynthesis. What photosynthesis accomplishes, why it's important, and how the light-dependent and light-independent reactions work together. Photosynthesis is usually represented by the equation 6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2. During this process, organisms such as plants go through the light-dependent and light-independent reactions to convert carbon dioxide and water into sugars and oxygen. Created by Sal Khan.
How and where photosynthesis evolved in the ancestors of cyanobacteria (along with a discussion of endosymbiosis).
This 10-minute video lesson looks at Newton's First Law (Galileo's Law of Inertia).
Introduction to pitching.
Primitive device for measuring electrostatic force. Created by Brit Cruise.
The video covers the first stages of idea generation for Bit-zee and how to make Bit-zee move. Created by Karl Wendt.