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displaying 1 - 6 of 6 lessons
| title | description | rating | updated | author | |
|---|---|---|---|---|---|
| Cohesion and Surface Tension |
Surface tension explains why dew drops are spherical, why a stream of liquid separates into droplets as it falls, and why some heavier-than-water objects can float on the surface of a still pond. In the absence of gravity, surface tension can be a powerful effect, as... |
(23 votes) |
27-May-2018 | guy |
 |
| Hair, Balloons and Static Electricity |
This lesson describes and explains the common effects of static electricity. It provides instructions for making a "pith ball" to study static electric effects from different materials, and includes data on many common materials. |
(162 votes) |
23-May-2017 | guy |
 |
| A Survey of Homemade Batteries |
A general overview of battery chemistry and operation, with examples of several types of homemade batteries. Tables of suggested materials and sources are included. |
(33 votes) |
2-May-2014 | guy |
 |
| Faraday Motor |
This lesson shows how to construct and operate a modern version of the first electric motor, invented by Michael Faraday. It serves as an excellent demonstration or hands-on activity to show the basic principles behind the operation of an electric motor. Learning goals... |
(9 votes) |
23-Apr-2014 | guy |
 |
| Battery Basics |
This lesson provides general background on the makeup, chemistry, and operation of batteries. Lecture slides attached. |
(8 votes) |
20-Apr-2014 | guy |
 |
| Super Absorbent Polymers - Diapers and Instant Snow |
Superabsorbent polymers (SAP's) are used to absorb and retain liquid in a variety of applications, including baby diapers and potting soil. One common SAP, known commercially as "instant snow", is sold as a white powder that can absorb several hundred times its weight in... |
(24 votes) |
23-Oct-2013 | guy |
 |