The University of Colorado at Boulder created a site full of dozens of interactive simulations in subjects such as physics, biology, chemistry, earth science, and math.
These free simulations can be used without registration. I allow my homeschooled teens to access the site freely, for curiosity’s sake. When we’re studying a certain concept, I’ll go the site and search for a simulation in that subject and topic area.
You can use this site alongside your lesson plans, of course, but it’s also a site where you could let the kids – especially young teens – freely roam, to pursue what interests them most.
Have your teen create his own simulation!
The simulations are open source. This means, your student may work on, and add, their own simulation to the site for others to use for learning! Each simulation goes through testing for accuracy.
How to Access the Free Science and Math Simulations:
Click the orange “Play with Sims” button. Look for new simulations; they are added to the site frequently (perhaps one created by your own child!).
Good Starting Points:
We’ve highlighted these other places to find free science and math simulations and online games:
Free Science Activities & Interactive Online Games for elementary students.
Free Multiplayer Quizzes for Science & Math (free, live, and online! my kids love these)