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Area Model of Partial Products
Elementary math teachers know the importance of this model in teaching the concept of applying distributive property in area model.
The idea is to break one large area (which represents the product of two numbers) into several pieces (products of smaller numbers), then to find the areas of the pieces individually, and finally add to get the area of the whole (the product of the given numbers).

Simulation Manual: Elastic Collision in One Dimension
A complete manual for the elastic collision in one dimension simulation, with a mathematical explanation of the derivation of the expressions of the final velocities in terms of the masses and the initial velocities.

Long Division Simulation – Float
If you or your student or child are having difficulties in learning long division, then you will find this simulation comprehensive and instructional, that guides the learner through the process step by step. This application is for long division with float quotient. Another application on long division with remainder is also available in the simulations section.

Virtual Oscilloscope is Now Mobile-Friendly!
This time I have updated Virtual Oscilloscope so it is now mobile-friendly. Long-press any button, knob, or slider and it will scale up to become comfortable enough for your touch so you can control it comfortably using your mobile device.
I also optimized the code to perform smoothly on mobile devices.

Simulation Manual: Charging by Induction
A complete manual for the charging by induction simulation, including a short introduction and a user guide.

Stroboscope Simulation
This simulation is of a rotating disk being illuminated by a stroboscope. You can control the speed of the disk and the frequency of the stroboscope, and see how the white spot on the disk appears. You can check all the cases of stationary appearance and the slow-motion appearance.