The PhET Blog

## Celebrate Spring with Hooke’s Law

Celebrate Spring by playing with springs. Stretch and compress springs to explore the relationships between force, spring constant, displacement, and potential energy! Investigate what happens when two springs are connected in series and parallel.

## Gravity Force Lab 2.0 Now with Fixed Radius Feature

We’ve just published Gravity Force Lab 2.0 with a “Constant Radius” feature so that you can change the mass of the objects without changing their size. Thanks to the teacher who suggested this new feature so that students can’t assume size is related to mass.

## Explore Light and Optics with Bending Light Sim

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

## Teaching Electricity and Circuits?

Tired of the JAVA Circuit Construction Kit? Want an HTML5 version? So do we! But PhET needs your help. Please donate today to bring Circuit Construction Kit to HTML5.

## Neuron Simulation Now Available in HTML5

Try the new HTML5 Neuron simulation. Stimulate a neuron and monitor what happens. Pause, rewind, and move forward in time in order to observe the ions as they move across the neuron membrane.

## Looking for Sims for iPad or for Chromebooks?

Looking for device-specific simulations? Just go to By Device in the left-hand navigation column.

• ‘iPad/Tablet’ lists all HTML5 sims or those that have an HTML5 version.
• ‘Chromebook’ lists all HTML5 sims or those that have an HTML5 version as well as all Flash sims. (Chromebooks support Flash.)

## Try the HTML5 Ohm’s Law

Try the ‪#‎HTML5‬ Ohm’s Law sim to see how the equation form of Ohm’s law relates to a simple circuit. Adjust the voltage and resistance, and see the current change according
to Ohm’s law.

## New HTML5 Trig Tour Sim

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.

## 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.

## 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.