Explore the role of size and shape in the strength of London dispersion attractions. While all molecules are attracted to each other, some attractions are stronger than others. Non-polar molecules are attracted through a London dispersion attraction; the strength of the attraction depends on the shapes and sizes of the interacting molecules. The force of attractions between molecules has consequences for their interactions in physical, chemical and biological applications.

The Fair model web site includes a freely available United States macroeconomic econometric model and a multicounty econometric model. The models run on the Windows OS. Instructors can use the models to teach forecasting, run policy experiments, and evaluate historical episodes of macroeconomic behavior. The web site includes extensive documentation for both models. The simulation is for upper-division economics courses in macroeconomics or econometrics. The principle developer is Ray Fair at Yale University.

Play with a bar magnet and coils to learn about Faraday's law. Move a bar magnet near one or two coils to make a light bulb glow. View the magnetic field lines. A meter shows the direction and magnitude of the current. View the magnetic field lines or use a meter to show the direction and magnitude of the current. You can also play with electromagnets, generators and transformers!

Light a light bulb by waving a magnet. This demonstration of Faraday's Law shows you how to reduce your power bill at the expense of your grocery bill.

Light a light bulb by waving a magnet. This demonstration of Faraday's Law shows you how to reduce your power bill at the expense of your grocery bill.

This Farming Fast Plants activity introduces a classroom investigation that is easily adaptable for all grade levels and designed to engage teachers and students as investigators. The activity has the practical outcome of producing an abundant supply of Fast Plants seed for future classroom use and for sharing with other teachers. The central question of the activity is "How many seeds can your students produce from each seed planted?

Sign up for a free account on the Gizmo website (https://www.explorelearning.com/index.cfm?method=Controller.dspFreeAccount) for free access to two simulations that were collaboratively developed by the teams at Explore Learning and the Wisconsin Fast Plants Program of the University of Wisconsin-Madison. These simulations replace those previously available on our website that were developed nearly two decades ago and no longer function on modern operating systems. Fast Plants Gizmos were created as a collaboration between ExploreLearning and the Wisconsin Fast Plants Program of the University of Wisconsin-Madison. They weredesigned to support many of the experiments that students can do using Fast Plants seeds and plants. By using these Gizmos in combination with firsthand experiences growing Fast Plants, students can compare simulated growth, development and reproduction with observations of living Fast Plants. In addition, the Gizmos genetic simulation makes it possible for students to gather data from a significantly larger plant population than is typically grown in classrooms. These Gizmos also stand alone, supporting topics both in plant life cycles and Mendelian genetics and can be used by any student. Simulation, Simulations, Genetics, Inheritance

This is a hands-on inquiry activity using zip-lock plastic bags that allows students to observe the process of fermentation and the challenge of producing ethanol from cellulosic sources. Students are asked to predict outcomes and check their observations with their predictions. Teachers can easily adapt to materials and specific classroom issues.

Lectures which precede this activity cover the different fossil groups, time period & depositional environment of the localities, as when as basic ecology & biodiversity. During class, the students go on a field trip to fossil localities to collect their data. Back in class, the students use the primary literature, fossil id books and web-based resources like Paleontology Portal to identify their fossil organisms. They perform a quantitative analysis of biodiversity, and reconstruct the paleocommunity based on their data and the literature. The end product is a scientific-style paper.

(Note: this resource was added to OER Commons as part of a batch upload of over 2,200 records. If you notice an issue with the quality of the metadata, please let us know by using the 'report' button and we will flag it for consideration.)

An interactive applet and associated web page that provide step-by-step instructions on how to find the center of a circle using only a compass and straightedge. The method used involves constructing the perpendicular bisectors of two random chords. The bisectors intersect at the center of the circle. The animation can be run either continuously like a video, or single stepped to allow classroom discussion and thought between steps. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

This is a 21 day unit on the topic of floods. Students will plan and prepare for what might happen in the event of a flood in our area. We have had floods in the past that have affected the Walterville School, its campus, and the surrounding areas. Using this as a springboard, students will discuss the effects of flooding, do research and interview family members who have experienced flooding, and then discuss possible ways to prevent significant damage on the buildings and surrounding areas. They will then design a barrier that could protect an area from damage for a period of time. Students will need materials to conduct experiments. We have listed these in the lesson plan. We have also included a trip to the Leaburg Dam so that students can learn about dams and their uses. We plan on teaching this unit in the fall.

Want to know a secret? Flowers actually ‘talk’ to animals! This beautifully written and illustrated informational text is a delightful way to introduce the symbiotic relationship between plants and pollinators. Full of interesting facts and told from the perspective of a “prickly” cactus, this book will enlighten and entertain your audience.Grade Level: 2nd-5th Lexile Level: 570L Guided Reading Level: Q Genre: Informational Text

This interactive online visualization allows the user to view a variety of weather patterns including temperature, wind, and wave action over time.

Explore pressure in the atmosphere and underwater. Reshape a pipe to see how it changes fluid flow speed. Experiment with a leaky water tower to see how the height and water level determine the water trajectory.

This interactive follows carbon as it moves through various components of the carbon cycle.

The Foothill College AstroSims project is ensuring continued access to astro-education simulations past the deprecation of Java and Flash. This site includes:

* re-implementations in HTML5/Javascript of existing astro-education simulations,
* new simulations of previously unaddressed topics, and
* a frequently updated list of astro-education simulations.

Explore the forces at work when you try to push a filing cabinet. Create an applied force and see the resulting friction force and total force acting on the cabinet. Charts show the forces, position, velocity, and acceleration vs. time. View a Free Body Diagram of all the forces (including gravitational and normal forces).

Explore the forces at work when you try to push a filing cabinet. Create an applied force and see the resulting friction force and total force acting on the cabinet. Charts show the forces, position, velocity, and acceleration vs. time. View a Free Body Diagram of all the forces (including gravitational and normal forces).

Explore the forces at work in a tug of war or pushing a refrigerator, crate, or person. Create an applied force and see how it makes objects move. Change friction and see how it affects the motion of objects.