This physics tutorial aims to model and predict not the motion of just one object, but rather what happens when two or more objects collide. The concept of momentum will be the main focus of this module.

This module is the introduction to model rotational motion. All of the concepts are conveniently recast into forms that have the same mathematical forms as their translational counterparts.

Combined with aspects of circular motion, students discover that Kepler's third law follows directly from the law of universal gravitation. This unit will expand upon the conservation of energy principle for problems beyond the confines...

In this unit, students will discover the period of time of one oscillation, the frequency of oscillation, the object displacement, its velocity, and its acceleration. They will also discover how to apply the principles of conservation of...

In this unit students discover the meaning and some applications of electric potential, commonly known as voltage, and how it powers some simple circuits.

In this interactive unit students will see how magnets work and how they are used in some of the most useful and common devices today.

In this interactive lesson about electromagnetic waves students will explore what they can see, what they can't, and what they know about the wave nature of this thing called "light."

This interactive unit will take students up close and personal with the nuclei of atoms as they discover some of their more intimate process. These will include radioactive decay, nuclear fission, and nuclear fusion.

In this interactive module students will explore the life cycle of stars and how they produce energy.

How is DNA evidence analyzed? What makes DNA evidence unique? This comprehensive interactive tutorial explores how old or degraded samples can be analyzed for DNA as well as how DNA profiles are stored.

Why are fingerprints unique to each individual? This comprehensive interactive tutorial explains how fingerprints are classified and stored in AFIS (Automated Fingerprint Identification System). Also explore how fingerprints are...

AP Comparative Government and Politics unit on Great Britain and Northern Ireland focus on the history, political institutions, and geography. Module includes multi-media resources for comprehensive study.

AP Government and Politics explores history of Mexico an influences of current state today. Includes multi-media and interactive resources.

AP U.S. History unit on Colonial America. Multi-media resources, interactive assignments, and assessment.

AP U.S. History course unit on the Revolutionary Era, including the road to war and major political changes brought about. Comprehensive multi-media module.

AP U.S. History unit covers the late 19th and early 20th Centuries, including the first World War and the Progressive Era. Comprehensive lesson materials and interactive media.

AP U.S. History unit on post-World War II and the Cold War. Comprehensive multi-media lessons, activities and assessment.

AP World History course unit on the Early Modern World, includes interactive lessons and assessment on Latin America, Africa, Islamic Empires and Asian Transitions.

U.S. History unit with interactive materials on the Industrial Revolution in America.

This lesson focuses on the four types of writing: narrative, descriptive, expository, and persuasive including definition and characteristics of each and an interactive activity over they types. It also provides links to more information...

This lesson focuses on sentence errors like fragments, run-ons, comma splices, and fused sentences. It expains these errors, provides examples, and offers an interactive practice activity.

This lesson is a review of the unit on types of writing including purpose, audience, tone, the writing process, the four types of writing, and sentence fragments and run-ons. A quiz is provided.

This lesson is an introduction to a unit on personal narratives including the characteristics of a personal narrative: tells a story, events are in chronological order, and it has characters, setting, and plot. Click next at the bottom...

This lesson focues on plot, irony, and suspense as seen in short stories by Richard Connell and Edgar Allan Poe. It defines each term and provides examples.