PhET Logo
The PhET Blog
Physics Education Technology - University of Colorado, Boulder

New HTML5 Trig Tour Sim

Trig Tour

We are excited to have just published the new HTML5 Trig Tour Sim. Take a tour of trigonometry using degrees or radians! Look for patterns in the values and on the graph when you change the value of theta. Compare the graphs of sine, cosine, and tangent.


Feb 8


Tackling Faraday’s Law in E&M Soon?


Tackling Faraday’s Law soon? Try the HTML5‬ Faraday’s Law sim, now translated into over 18 languages.


Feb 5


Have Some Winter Indoor Fun with Static Electricity


Stuck indoors? Have some fun with Balloons and Static Electricity. Rub the balloon on the sweater and see what happens.



Jan 29


PhET is an Open Source Project!

Did you know as an project all of our code is on ?


Jan 21


Call for Photos of International Students Using PhET Sims

Do you have a photo of students using a PhET sim that we could use? We are looking for high-resolution photos of our sims being used by students. If you have one that you can contribute, please e-mail


Jan 15


Going to FETC 2016 in Orlando?


Visit PhET at #FETC 2016 in Orlando, FL January 13-15. PhET’s Science Specialists, Amy Rouinfar and Amy Hanson, will be at our Booth #1007 to answer your questions and show off our latest HTML5 sims and other exciting developments coming up in 2016!

About Future of Education Technology Conference (FETC)
The Future of Education Technology Conference (FETC) gathers education leaders and technology experts to exchange techniques and strategies for teaching and learning success. Known worldwide for its outstanding program, FETC provides educators and administrators the opportunity to explore the integration of technology across the curriculum — from pre-K – 12 — through hands-on exposure to the latest hardware, software and successful strategies. For more information, please visit


Jan 7


Scheduled Maintenance: Monday, January 4, 2016 at 11:00 PM Mountain Standard Time

We will be upgrading the PhET servers on Monday, January 4 at 11:00 PM Mountain Standard Time. We expect that the maintenance will last only 60 minutes. During this time, PhET ( may experience periods of unavailability. If you experience persistent issues, please e-mail the PhET Help Desk at

Thanks for your patience during our system maintenance.


Jan 3


Happy New Year and There’s Still Time!

Happy New Year to everyone around the world.

We are excited to bring more HTML5 sims in 2016. Won’t you help us with a small $10 donation?

And, thanks to everyone who has already donated in 2015! It really helps support the HTML5 work.

Donate today at:



Dec 30


New HTML5 Bending Light Sim!


Play with the new HTML5 Bending Light sim and explore how light bends when it encounters an interface of two different indices of refraction. See how changing from air to water to glass changes the bending angle. Play with prisms of different shapes and make rainbows.



Dec 23


New HTML5 Arithmetic Sim


We are excited to have the HTML5 version of Arithmetic. Learn multiplication, division and factoring with this new sim!



Dec 18