Adjust properties of the objects to see how changing the properties affects the gravitational attraction.
PhET: Gravity Force Lab Visualize the gravitational force that two objects exert on each other. Visualize the sizes and distances between different heavenly bodies, and turn off gravity to see what would happen without it! PhET: Gravity and Orbits Move the sun, earth, moon and space station to see how it affects their gravitational forces and orbital paths. 
Note that the interactive elements in this sim have simple description that can be accessed using a screen reader.
PhET: Friction Move the Chemistry book and observe what happens. Change friction and see how it affects the motion of objects. Create an applied force and see how it makes objects move. 
PhET: Forces and Motion: Basics Explore the forces at work when pulling against a cart, and pushing a refrigerator, crate, or person. PhET: Faraday's Law Investigate Faraday's law and how a changing magnetic flux can produce a flow of electricity!. Build your own tracks, ramps, and jumps for the skater. PhET: Energy Skate Park - Basics Learn about conservation of energy with a skater gal! Explore different tracks and view the kinetic energy, potential energy and friction as she moves. View the light as a solid beam, or see the individual photons. Change the wavelength of a monochromatic beam or filter white light. PhET: Color Vision Make a whole rainbow by mixing red, green, and blue light. View the circuit as a schematic diagram, or switch to a lifelike view. Determine if everyday objects are conductors or insulators, and take measurements with a lifelike ammeter and voltmeter. Build circuits with batteries, resistors, light bulbs, and switches. PhET: Circuit Construction Kit: DC - Virtual Lab Do you like Circuit Construction Kit: DC, but want to use only in-line ammeters? This is the sim for you! Experiment with an electronics kit. Determine if everyday objects are conductors or insulators, and take measurements with an ammeter and voltmeter. PhET: Circuit Construction Kit: DC Experiment with an electronics kit! Build circuits with batteries, resistors, light bulbs, and switches. Create models of dipoles, capacitors, and more! Plot equipotential lines and discover their relationship to the electric field. PhET: Charges and Fields Arrange positive and negative charges in space and view the resulting electric field and electrostatic potential. Connect a charged capacitor to a light bulb and observe a discharging RC circuit. 
View the electric field, and measure the voltage. Change the voltage and see charges build up on the plates. PhET: Capacitor Lab - Basics Explore how a capacitor works! Change the size of the plates and the distance between them.PhET: Build an Atom Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change.Play with prisms of different shapes and make rainbows. See how changing from air to water to glass changes the bending angle. PhET: Bending Light Explore bending of light between two media with different indices of refraction.PhET: Balloons and Static Electricity Why does a balloon stick to your sweater? Explore the charges in the sweater, balloons, and the wall as you investigate!.Test what you've learned by trying the Balance Challenge game. PhET: Balancing Act Play with objects on a teeter totter to learn about balance.
Customize the attraction to see how changing the atomic diameter and interaction strength affects the interaction. Observe the the total force acting on the atoms or the individual attractive and repulsive forces. PhET: Atomic Interactions Explore the interactions between various combinations of two atoms.
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