Given the equation of a quadratic function in vertex form, students learn to identify the vertex of a parabola from the equation, and then graph the parabola. Two different quadratic equations are provided in this activity.

Students solve two problems involving the motion of projectile objects, modeled using quadratic equations. Students graph parabolas and use the graphs to answer questions about projectile objects. Students identify the maximum heights of the moving objects and discover how long each object is in the air before hitting the ground.

Students solve two problems modeled by quadratic equations. One problem involves profits from a business and the other, water draining from a bathtub. Students graph quadratic equations and use their graphs to answer questions.

Delve into a microscopic world working with models that show how electron waves can tunnel through certain types of barriers. Learn about the novel devices and apparatuses that have been invented using this concept. Discover how tunneling makes it possible for computers to run faster and for scientists to look more deeply into the microscopic world.

How does energy flow in and out of our atmosphere? Explore how solar and infrared radiation enters and exits the atmosphere with an interactive model. Control the amounts of carbon dioxide and clouds present in the model and learn how these factors can influence global temperature. Record results using snapshots of the model in the virtual lab notebook where you can annotate your observations.

Observe a reaction between hydrogen and oxygen atoms, and watch how potential and kinetic energy change.

Carefully observe changes in kinetic and potential energy as hydrogen and oxygen molecules react.

The MC1R gene, in part, controls deer mouse fur. Two alleles, RD and RL, in different combinations lead to light, medium, or dark brown fur. Students learn how to calculate relative allele frequencies, and then investigate how these frequencies may change over time as the environment in which the deer mice live changes. The activity is divided into four steps, which guide students to a deeper understanding of how evolution is measured.

Measure relative humidity in the air using a simple device made of a temperature sensor, a plastic bottle, and some clay. Electronically plot the data you collect on graphs to analyze and learn from it. Experiment with different materials and different room temperatures in order to explore what affects humidity.

Use a virtual scanning tunneling microscope (STM) to observe electron behavior in an atomic-scale world. Walk through the principles of this technology step-by-step. First learn how the STM works. Then try it yourself! Use a virtual STM to manipulate individual atoms by scanning for, picking up, and moving electrons. Finally, explore the advantages and disadvantages of the two modes of an STM: the constant-height mode and the constant-current mode.

Explore different types of attractions between molecules. While all molecules are attracted to each other, some attractions are stronger than others. Non-polar molecules are attracted through a London dispersion attraction; polar molecules are attracted through both the London dispersion force and the stronger dipole-dipole attraction. The dipole-dipole attraction is often thought of as 'opposite charges attract; like charges repel.' The force of attractions between molecules has consequences for their interactions in physical, chemical and biological applications.

Explore your own straight-line motion using a motion sensor to generate distance versus time graphs of your own motion. Learn how changes in speed and direction affect the graph, and gain an understanding of how motion can be represented on a graph.

Explore the pattern of earthquakes on Earth, including magnitude, depth, location, and frequency.

Semiconductors are the materials that make modern electronics work. Learn about the basic properties of intrinsic and extrinsic or 'doped' semiconductors with several visualizations. Turn a silicon crystal into an insulator or a conductor, create a depletion region between semiconductors, and explore probability waves of an electron in this interactive activity.

Investigate what makes something soluble by exploring the effects of intermolecular attractions and what properties are necessary in a solution to overcome them. Interactive models simulate the process of dissolution, allowing you to experiment with how external factors, such as heat, can affect a substance's solubility.

Two linear equations, with two variables, are presented and students use graphs to solve the system of equations. Students graph the lines and solve the problem using the graphs.

What happens when an excited atom emits a photon? What can we deduce about that atom based on the photons it can emit? A series of interactive models allows you to examine how the energy levels the electrons of an atom occupy affect the types of photons that can be emitted. Use a digital spectrometer to record which wavelengths certain atoms will emit, and then use this knowledge to compare and identify types of atoms. Students will be abe to:

Explore the factors that affect a spring's motion. A spring is a resilient device that can be pressed or pulled but return to its original shape when released. Springs are commonly helical coiled metal devices. When a spring is compressed or stretched and then released, it will vibrate at a particular frequency. This frequency is called the period of the spring. Experiment by changing the spring constant (a measure of the elasticity of the coils), the mass of the weight at the end of the spring, the initial extension or compression of the spring or the friction (or damping force) exerted on the spring. Which of these factors affect the period of the spring?

Explore the movement of gases, liquids and solids at a molecular level, and investigate how temperature and intermolecular attractions affect phase changes.

Stebbins is a game about evolution. Students collect data as predators "eating" colored circles on a colored background, being careful to avoid the poisonous ones. Data analysis reveals how the population changes color over time, and can be used to illuminate a common misconception that individuals change in response to predation. Stebbins is modeled on a non-digital game-like simulation of natural selection created by evolutionary biologist G. Ledyard Stebbins.