Explore the role of a molecule's mass with respect to its diffusion rate. Diffusion is the process of a substance spreading out from its origin. Molecules diffuse through random molecular motion. Diffusion is always happening, even when a system appears to have reached equilibrium, because molecules are always moving. Massive molecules have more kinetic energy than less massive molecules at the same temperature.

Explore the role of temperature in the rate of diffusion of a substance. Diffusion is the process of a substance spreading out from its origin. Molecules diffuse through random molecular motion. Diffusion is always happening, even when a system appears to have reached equilibrium, because molecules are always moving. When molecules are heated, they move faster.

Explore the role of temperature in the rate of diffusion of a substance. Diffusion is the process of a substance spreading out from its origin. Molecules diffuse through random molecular motion. Diffusion is always happening, even when a system appears to have reached equilibrium, because molecules are always moving. When molecules are heated, they move faster.

Explore the strength and direction of forces between two charged objects by observing the color and direction of the force pointers.

Observe the direction of forces between a negatively charged Van de Graaff generator and a positively charged object.

Drag around a stationary charged object and observe the force on the stationary object when it is positive and negative.

Explore how the polarity of molecules affects how they mix (or don’t) when combined.

Students learn the principles of independent assortment and gene linkage in activities which analyze inheritance of multiple genes on the same or different chromosomes in hypothetical dragons. Students learn how these principles derive from the behavior of chromosomes during meiosis and fertilization.

In this simulation activity students mimic the processes of meiosis and fertilization to investigate the inheritance of multiple genes and then use their understanding of concepts such as dominant/recessive alleles, incomplete dominance, sex-linked inheritance, and epistasis to interpret the results of the simulation. This activity can be used as a culminating activity after you have introduced classical genetics, and it can serve as formative assessment to identify any areas of confusion that require additional clarification.

Play hockey with electric charges. Place charges on the ice, then hit start to try to get the puck in the goal. View the electric field. Trace the puck's motion. Make the game harder by placing walls in front of the goal. This is a clone of the popular simulation of the same name marketed by Physics Academic Software and written by Prof. Ruth Chabay of the Dept of Physics at North Carolina State University.

Set the amount and type of charge on particles and compare the potential energy of the electric field that is generated.

Set the charge of two particles and compare the potential energy of the electric field they generate as the particles are moved around.

Apply knowledge of the interactions between charged particles to guide an object through a maze.

Compare the surface charges on various molecules and explore which atom types tend to cause uneven sharing of electrons.

Learn about conservation of energy with a skater dude! Build tracks, ramps and jumps for the skater and view the kinetic energy, potential energy and friction as he moves. You can also take the skater to different planets or even space!

Great to use as an introduction to kinetic and potential energy transformations. This simulation shows how kinetic, potential, and thermal energy transformations occur as a person skates on a ramp. It graphs the relative values so that students can see the change in energy with the change in the position of the person.

Explore how different elements come together to form bonds and compare changes in potential energy and forces.

Set the initial height of a pendulum and observe how potential, kinetic, and thermal energy change during pendulum swings.