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displaying 1 - 10 of 37 lessons
title description rating updated author
Iron and Magnets

This lesson provides general backround on magnets, and suggests several classroom activities involving magnets and iron filings. These include 

  • identifying magnetic materials
  • staging paper clip battles
  • finding the north pole of a magnet
  • ...
Average: 2.8 (17 votes)
16-Oct-2023 guy bar magnet with field lines
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...

Average: 3.9 (24 votes)
27-May-2018 guy water strider
Soda Bottle Rocket

This lesson gives instructions for a simple rocket that can be constructed out of a soda bottle and some alcohol in a matter of seconds. I also explain the basic principles of rocket propulsion (Newton's 3rd law) and offer some suggested design refinements, including a...

Average: 3.6 (15 votes)
23-May-2017 guy alcohol rocket
Basic Electromagnets

This lesson provides some general background on electromagnets and describes three simple activities for students to explore on their own. For reference, it also includes formulas for the magnetic field strength around several common types of electromagnets.


Average: 3.3 (8 votes)
23-May-2017 guy wire solenoid with bolt
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.

Average: 3.8 (163 votes)
23-May-2017 guy sciphile and balloon
Magnetic Materials

This lesson is a brief guide to exploring magnetic materials. It lists a variety of everyday metals, their magnetic properties, and where to find them. Students are encouraged to locate as many examples as they can, and test them with magnets. A checklist for students is...

Average: 3.6 (105 votes)
1-Aug-2016 guy
Bernoulli's Principle and the Venturi Tube

The Bernoulli principle states that a region of fast flowing fluid exerts lower pressure on its surroundings than a region of slow flowing fluid. The principle applies to the motion of air over an airplane wing, to air flow through a carburetor, to a flag flapping in the...

Average: 4.2 (98 votes)
6-Jul-2016 guy
Stacked Ball Drop - Lessons in Conservation of Energy and Momentum

Drop a stack of balls on the floor. By carefully choosing the relative masses of the balls, it is possible to send the top ball flying many times higher than the distance it fell. Analysis of the collision offers good lessons in relative motion and the conservation of...

Average: 4.1 (88 votes)
9-Jun-2016 guy Ball Drop
Smoke Ring Machines and Dolphin Bubbles

Smoke rings offer wonderful lessons in fluid dynamics. Use them to initiate discussions on fluid flow, air pressure, and Bernoulli's principle. This lesson contains instructions for how to build your own smoke ring machine out of an empty soda bottle, and outlines the...

Average: 4 (10 votes)
25-May-2016 guy vortex chamber
Minimalist Motors


Building a simple motor is much easier than most people realize. All it takes is a battery, a magnet and a piece of wire. This lesson reviews some simple motors and demonstrates a minimalist design constructed from a button cell battery, some wire, and a small but...

Average: 4 (5 votes)
7-Jan-2016 guy