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Over 3,800 Videos

Our library of videos covers K-12 math, science topics such as biology, chemistry, and physics, and even reaches into the humanities with playlists on finance and history. Each video is a digestible chunk, approximately 10 minutes long, and especially purposed for viewing on the computer.

You're joining millions of Khan Academy students from all over the world who learn at their own pace every single day.

 
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Waves and optics : Parabolic Mirrors 2

By: Sal Khan

Parabolic Mirrors 2

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Object Image Height and Distance Relationship

By: Sal Khan

Object Image Height and Distance Relationship

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Object Image and Focal Distance Relationship (P...

By: Sal Khan

Object Image and Focal Distance Relationship (Proof of Formula)

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Mach Numbers

By: Sal Khan

Mach numbers

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Introduction to Waves

By: Sal Khan

Introduction to transverse and longitudinal waves

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Introduction to the Doppler Effect

By: Sal Khan

Introduction to the Doppler Effect

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Doppler effect formula when source is moving away

By: Sal Khan

Doppler effect formula when source is moving away

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Doppler effect formula for observed frequency

By: Sal Khan

Doppler effect formula for observed frequency

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Convex Parabolic Mirrors

By: Sal Khan

Convex Parabolic Mirrors

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Convex Lenses

By: Sal Khan

Convex Lenses

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Convex Lens Examples

By: Sal Khan

Convex Lens Examples

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Concave Lenses

By: Sal Khan

Concave Lenses

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Amplitude, Period, Frequency and Wavelength of ...

By: Sal Khan

Amplitude, period, frequency and wavelength of periodic waves

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Volume and surface area : Volume of a Sphere

By: Sal Khan, Monterey Institute for Technology and Education

Volume of a Sphere

A broad set of tutorials covering perimeter area and volume with and without algebra. Tired of perimeter and area and now want to measure 3-D space-take-upness. Well you've found the right tutorial. Enjoy!

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Volume and surface area : Solid Geometry Volume

By: Sal Khan

Volume of triangular prisms and cubes

A broad set of tutorials covering perimeter area and volume with and without algebra. Tired of perimeter and area and now want to measure 3-D space-take-upness. Well you've found the right tutorial. Enjoy!

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Volume and surface area : Cylinder Volume and Surface Area

By: Sal Khan

Finding the volume and surface area of a cylinder

A broad set of tutorials covering perimeter area and volume with and without algebra. Tired of perimeter and area and now want to measure 3-D space-take-upness. Well you've found the right tutorial. Enjoy!

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Vi Hart : What was up with Pythagoras?

By: Vi Hart

Pythagoras had a problem with beans and irrationality. What really happened? I don't know! The square root of two is irrational, and beans are delicious.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : What is up with Noises? (The Science and Mathematics of ...

By: Vi Hart

Accuracy not guaranteed. Get Audacity and play! Correction: it is the Basilar membrane, which is what I say, but somehow between recording the script and actually drawing the stuff I got confused and thought I just pronounced my Vs poorly. Always sad to

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Wau: The Most Amazing, Ancient, and Singular Number

By: Vi Hart

What other amazing properties of Wau can you think of? Leave them in the comments.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : The Gauss Christmath Special

By: Vi Hart

Christmas ain't over yet. The 12th day is Jan. 6th! You can get just the song here

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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