

Plastic frame with two colored rods. The trick here is to determine, solely by looking at the frame from two sides set 90o apart (as seen above) whether the sticks are touching or not.
This can be useful when discussion ideas of perspective and imaging. Try showing the model from a single angle, perhaps with a video camera, and invite students to draw it; then rotate it and have them compare their results.
Compare the weights of one kilogram (SI unit of mass) to one pound (English system unit of force) Read More
Show a collection of calibrated masses Read More
Demonstrate the concept of density Read More
Compare the length of one meter (SI unit) to that of one yard (English unit) Read More
Make measurements in the metric system Read More
Means to show different intervals of time Read More
Means to show different intervals of time Read More
Illustrate metric volume units Read More
Illustrate a volume perception paradox Read More
Visualize three-dimensional figures Read More
Visualize three-dimensional figures Read More
Visualize three-dimensional figures Read More
Show things with a skateboard Read More