Figuring how long it takes an A380 to take off given a constant acceleration. Created by Sal Khan.

Students experiment and hypothesize about surface tension and cohesion, using water, ground black pepper, liquid soap, and other household products.

This activity is a guided inquiry investigation where students will propose a question on what makes an electromagnet stronger. They will conduct a controlled experiment to answer their own question.

Here’s a new “spin” on an old toy. In this modern adaptation of a classic toy—the spool racer—a plastic water bottle is propelled by energy stored in a wound-up rubber band.

The purpose of this exercise is to learn how to think about gravity, learn about scientific methodology, and transition from the Aristotelian to Newtonian to Einsteinian understanding of gravity.

When you spin it around, this toy sounds like a swarm of buzzing bees.

Linear velocity from the radius and angular velocity for two pumpkin catapults with different arm lengths.

Work needed to compress a spring is the same as the potential energy stored in the compressed spring. Created by Sal Khan.

A conservative force exists when the work done by that force on an object is independent of the object's path. Instead, the work done by a conservative force depends only on the end points of the motion. An example of a conservative force is gravity. Created by David SantoPietro.

David explains what it means for a collision to be elastic or inelastic. Created by David SantoPietro.

David explains how and why standing waves occur, and well as how to determine the wavelengths for a standing wave on a string. Created by David SantoPietro.

David explains the rotational kinematic formulas and does a couple sample problems using them. Created by David SantoPietro.

Learn about the Doppler effect and how it explains the change in frequency of a wave when its source and an observer are moving. Created by Sal Khan.

Full Curriculum, Newtonian Mechanics whereby fundamental concepts (momentum, energy, force, motion) are introduced on the first day and developed in parallel. Access entire curriculum: comprehensive lecture videos with questions, textbook (calculus based, algebra based, and conceptual), exams, syllabus, past student evaluations.

In this classroom experiment the students will observe primary colors mixing together to create a secondary color.

This is a guided inquiry in which the students determine how a light bulb works.

Designed for lower elementary, but can be used at any age for a warm up or station activity. Can be done in a regular classroom, physical education class or at home. Great fitness activity done with using only a deck of cards

A great variety of processes affect the surface of the Earth. Topics to be covered are production and movement of surficial materials; soils and soil erosion; precipitation; streams and lakes; groundwater flow; glaciers and their deposits. The course combines aspects of geology, climatology, hydrology, and soil science to present a coherent introduction to the surface of the Earth, with emphasis on both fundamental concepts and practical applications, as a basis for understanding and intelligent management of the Earth's physical and chemical environment.

Students construct a geologic map of a region of Venus' surface using NASA Magellan synthetic aperture radar(SAR) data (provided) and/or synthetic stereo data (provided, and constructed using Magellan SAR and altimetry data)- 3D anaglyph viewed through red-blue glasses. Mapping can be done digitally using Adobe Illustrator (or a similar graphic program) or using hard copy images and overhead transparencies for mapping. Students construct a complete geologic map, determine a geologic history for the area, and propose hypotheses for the evolution of a large quasi-circular geomorphic/geologic feature that occurs within the map area. Students also propose tests of their hypotheses (whether such tests can be accomplished through further mapping, future missions, experiments, theoretical arguments, calculations, etc.). Students must clearly identify assumptions they make in their hypotheses/models. Individual, or small group, write-ups and completed geologic maps summarize student analysis. This activity connects structural geology to other fields, and provides the students with an opportunity to experience geologic investigation in which there is no single right answer, but there are "wrong" or unlikely hypotheses. This exercise helps students think outside the box with little fear given that they are dealing with - literally - an extraterrestrial world in which very little is known - and yet, we assume that chemistry and physics, as we know them, likely operated on Earth's sister planet. Students are given a short introductory presentation about the environmental conditions of Venus (which could have been different in the past), and an introduction to radar data before they begin.

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The purpose of this resource is to observe plant green-up and report data that will be used by scientists to validate satellite estimates of the beginning of the plant growing season. Students monitor budburst and growth of leaves of selected trees, shrubs, or grasses. Species chosen should be native, deciduous, and dominant in your area.