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displaying 21 - 30 of 52 lessons
| title | description | rating | updated | author | |
|---|---|---|---|---|---|
| Seeing Blood Vessels in the Eye |
Describes a technique for seeing the shadows of blood vessels in your eye. Provides a great opportunity for discussing the anatomy of the eye. Requires a dark place. For more examples of optical illusions caused by visual desensitization, check out our summary... |
(6 votes) |
3-Jun-2015 | guy |
 |
| Cheshire Cat Illusions |
Cheshire cat illusions are images that fade slowly away as you stare at them. They result from desensitization in the eye (and brain) when you view them without moving your eyes. This lesson explains the mechanism behind the disappearance, and provides several examples of... |
(7 votes) |
3-Jun-2015 | guy |
 |
| Yang and Yin - negative afterimages |
This lesson provides a tutorial on the mechanism behind negative afterimages, and includes three afterimage illusions for demonstration. Lecture slides are attached with all images. For more examples of optical illusions caused by visual desensitization, check out our... |
(6 votes) |
3-Jun-2015 | guy |
 |
| Bernoulli's Beach Ball |
This lesson describes how to float a beach ball on a stream of air. The exercise makes for a magical demonstration in front of a large audience or a lot of fun in an office full of paper. Use it to teach the concept of Bernoulli's principle, which describes the relation... |
(9 votes) |
3-Jun-2015 | guy |
 |
| Bernoulli's Balloon |
Bernoulli's principle states that a region of fast moving fluid exerts less pressure on its surroundings than a region of slow moving fluid. This principle explains a clever trick for blowing up a long thin balloon in a single breath. Stage a friendly competition in class... |
(9 votes) |
3-Jun-2015 | guy |
 |
| Vortex in a Bottle |
Instructions for building the vortex in a bottle, a device that produces a vortex like the one found in a bathtub drain. The device is completely self-contained and can be used in any classroom setting. It is simple enough and cheap enough for students to build their own to... |
(9 votes) |
31-May-2015 | guy |
 |
| Desk Chair Angular Momentum |
Describes a simple demonstration of angular momentum conservation using a spinning desk chair. A short tutorial of angular momentum and angular momentum conservation is included. |
(5 votes) |
28-May-2015 | guy |
 |
| A Floating Compass |
This lesson provides
learning goals:
For other ideas and more in-depth... |
(5 votes) |
22-May-2015 | guy |
 |
| Earth's Magnetic Field |
This lesson gives some information on Earth's magnetic field: the physics of how it is produced and its geologic history. Many suggestions for further reading are also listed. It might be considered useful background for any activity having to do with magnetic compasses.... |
(5 votes) |
22-May-2015 | guy |
 |
| Diamagnetism - Levitating Graphite and Frogs |
Diamagnetic materials are repelled by a magnet, in contrast to magnetic materials (like iron), which are attracted to a magnet. This lesson describes several demonstrations of diamagnetic repulsion using water and graphite (both diamagnets), with inexpensive setups. The most... |
(8 votes) |
22-May-2015 | guy |
 |