This learning video explores the mysterious physics behind boomerangs and other rapidly spinning objects. Students will get to make and throw their own boomerangs between video segments! A key idea presented is how torque causes the precession of angular momentum. One class period is required to complete this learning video, and the optimal prerequisites are a familiarity with forces, Newton's laws, vectors and time derivatives. Each student would need the following materials for boomerang construction: cardboard (roughly the size of a postcard), ruler, pencil/pen, scissors, protractor, and a stapler.

This video lesson explores Newton's Third Law of Motion through examination of several real world examples of this law in action, including that of a donkey cart - a site common in the streets of Pakistan. Students will understand that forces act on objects even if the objects appear to be static and that certain conditions - gravity in particular - affect how two objects interact. The time needed to complete this lesson is approximately 50-60 minutes, and students should be familiar with basic mechanics such as Newton's laws, levers, etc. The materials required are a couple of spring balances, a meter rule, tape, pencil, two desks, and some lab weights (few grams each). The types of in-class activities for between the video breaks include active discussions and participation by students in activities related to the Third Law.

The objective of this lesson is to illustrate how a common everyday experience (such as playing pool) can often provide a learning moment. In the example chosen, we use the game of pool to help explain some key concepts of physics. One of these concepts is the conservation of linear momentum since conservation laws play an extremely important role in many aspects of physics. The idea that a certain property of a system is maintained before and after something happens is quite central to many principles in physics and in the pool example, we concentrate on the conservation of linear momentum. The latter half of the video looks at angular momentum and friction, examining why certain objects roll, as opposed to slide. We do this by looking at how striking a ball with a cue stick at different locations produces different effects.

This art history video presents a conversation between Salman Khan and Steven Zucker about sculpture and the language of representation. They examine Pablo Picasso's "Guitar" (1912-) 1914, made of ferrous sheet metal and wire. It's currently at the The Museum of Modern Art.

This art history video discussion examines Pablo Picasso's "Les Demoiselles d'Avignon", 1907 (Museum of Modern Art).

This art history video discussion looks at Pablo Picasso's "The Reservoir (Horta de Ebro)", oil on canvas, summer 1909 (MoMA).

This art history video discussion looks at Piero della Francesca's "Portraits of the Duke and Duchess of Urbino", Federico da Montefeltro and Battista Sforza, 1467-72, tempera on panel (Galleria degli Uffizi, Florence).

This art history video discussion looks at Piero della Francesca's "The Baptism of Christ", 1450s, tempera on wood, 167 x 116 cm (National Gallery, London).

This art history video discussion examines Pierre Le Gros the Younger's "Stanislas Kostka on His Deathbed", 1703, upstairs at Bernini's Sant'Andrea al Quirinale.

This short video and interactive assessment activity is designed to teach fourth graders about four operations - missing operation.

This short video and interactive assessment activity is designed to teach fifth graders about adding, subtracting, multiplying and dividing - missing operation.

This short video and interactive assessment activity is designed to teach fourth graders about adding, subtracting, and multiplying with parentheses - missing operation.

This short video and interactive assessment activity is designed to teach fifth graders about adding and subtracting with parentheses ii.

This short video and interactive assessment activity is designed to teach fifth graders about placing the missing parentheses to make the equation true.

This short video and interactive assessment activity is designed to teach fourth graders about placing the missing parentheses to make the equation true.

This short video and interactive assessment activity is designed to teach second graders an overview - thousandths.

This short video and interactive assessment activity is designed to give fourth graders an overview of - thousandths.

This short video and interactive assessment activity is designed to teach fourth graders about using both division and multiplication - word problems.

This short video and interactive assessment activity is designed to teach third graders about finding the amount of change - multiplication.

This short video and interactive assessment activity is designed to teach third graders about place value problems involving money.