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2D Rotation Using Matrices
Conditions of Use:
Remix and Share
Rating

This Demonstration illustrates the concept of rotating a 2D polygon. The rotation matrix is displayed for the current angle. The default polygon is a square that you can modify.

Subject:
Geometry
Material Type:
Activity/Lab
Diagram/Illustration
Homework/Assignment
Interactive
Simulation
Teaching/Learning Strategy
Provider:
Wolfram Research
Provider Set:
Wolfram Demonstrations Project
Author:
Mito Are and Valeria Antohe
Date Added:
09/04/2013
30-60-90 triangle
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that demonstrate the properties of a 30-60-90 triangle. The applet shows a right triangle that can be resized by dragging any vertex. As it is dragged, the remaining vertices change so that the triangle's angles remain 30 degrees, 60 degrees and 90 degrees The text on the page points out that the sides of a 30-60-90 triangle are always in the ratio of 1 : 2 : root 3 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
3:4:5 triangle
Conditions of Use:
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Rating

An interactive applet and associated web page that demonstrate the properties of a 3:4:5 triangle - one of the Pythagorean triples. The applet shows a right triangle that can be resized by dragging any vertex. As it is dragged, the remaining vertices change so that the triangle's side remain in the ration 3:4:5. The text on the page has an example of how the triangle can be used to measure a right angle on even large objects. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
3D FractaL-Tree
Conditions of Use:
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Rating

3D FractaL-Tree allows scientists to collect data from actual specimens in the field or laboratory, insert these measurements into a spatially explicit L-system package, and then visually compare to the computer generated 3D image with such specimens. The measurements are recorded and analyzed in a series of worksheets in Microsoft Excel퉌Ź and the results are entered into the graphics engine in a Java applet. 3D FractaL-Tree produces a rotatable three-dimensional image of the tree which is helpful for examining such characters as self-avoidance (entanglement and breakage), penetration of sunlight, distances that small herbivores (such as caterpillars) would have to traverse to go from one tip to another, and Voronoi polyhedra of volume distribution of biomass on different subsections of a tree. These and other factors have been discussed in the Adaptive Geometry of Trees (Horn, 1971). Three different representations are available in 3D FractaL-Tree images: wire frame, solid, and transparent. Easy options for saving and exporting images are included.

Subject:
Biology
Material Type:
Activity/Lab
Simulation
Provider:
BioQUEST Curriculum Consortium
Provider Set:
The Biological ESTEEM Collection
Author:
Jennifer Spangenberg
John Jungck
Jutarat Maneewattanapluk
Noppadon Khiripet
Rawin Viruchpinta
Date Added:
07/18/2007
3D FractaL-Tree
Conditions of Use:
Read the Fine Print
Rating

This interactive L-system simulation produces visualizations of tree forms based on data from specimens in the field or laboratory.

Subject:
Biology
Material Type:
Activity/Lab
Diagram/Illustration
Interactive
Lesson Plan
Simulation
Provider:
BioQUEST Curriculum Consortium
Provider Set:
The BioQUEST Library Online
Author:
Jennifer A Spangenberg
John R. Jungck
Jutarat Maneewattanapluk
Noppadon Khiripet
Rawin Viruchpinta
Date Added:
04/25/2013
45-45-90 triangle
Conditions of Use:
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Rating

An interactive applet and associated web page that demonstrate the properties of a 45-45-90 isosceles right triangle. The applet shows a right triangle that can be resized by dragging any vertex. As it is dragged, the remaining vertices change so that the triangle's angles remain 45 degrees, 45 degrees and 90 degrees The text on the page points out that the sides of a 45-45-90 triangle are always in the ratio of 1 : 2 : root 2 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
52 Minute Challenge
Conditions of Use:
Remix and Share
Rating

Students get one class period (52 minutes) to find a real problem on campus, document it, develop a solution and prepare a market-based presentation to be peer-reviewed the next day. The main goal of this project is to highlight the importance of collaboration when working under a tight deadline - a common situation in today's working world.

This project integrates engineering, design and business concepts and meets learning standards from 9th to 12th grade.

Subject:
Applied Science
Business and Communication
Career and Technical Education
Physical Science
Material Type:
Assessment
Interactive
Lecture
Lesson Plan
Simulation
Teaching/Learning Strategy
Provider:
Allen Distinguished Educators
Date Added:
11/04/2015
AAA Doesn't work
Conditions of Use:
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Rating

An interactive applet and associated web page that shows that angle-angle-angle (AAA) is not enough to prove congruence. The applet shows two triangles, one of which can be dragged to resize it, showing that although they have the same angles they are not the same size and thus not congruent. The web page describes all this and has links to other related pages. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
AAA Triangle similarity test
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page showing how the AAA similarity test works. Two similar triangles are shown that can be resized by dragging. The other triangle adjusts to remain similar and the angle-angle-angle elements are highlighted to show how they are involved in this test of similarity. (all three interior angles congruent). The web page describes all this and has links to other related pages. 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 reference book project at http://www.mathopenref.com.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
AAS Congruent Triangles
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that shows how triangles that have two angles and a non-included side the same must be congruent. The applet shows two triangles, one of which can be reshaped by dragging any vertex. The other changes to remain congruent to it and the two angles and non-included side are outlined in bold to show they are the same measure and are the elements being used to prove congruence. The web page describes all this and has links to other related pages. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
AP08 - Anatomy Physiology - The Appendicular Skeleton
Conditions of Use:
No Strings Attached
Rating

This Free Mini MOOC provides Quick introduction to "Anatomy Physiology - The Appendicular Skeleton" in just a Single Week, on your Smartphone with Off-Line Access after initial onetime download ! This Mini MOOC provides following features:
01. Smartphone compatible Responsive Design
02. Glossary
03. EBook
04. HTML5 Interactive Activities
05. Question-Answer Discussion Forum
06. Single Week duration with Study Plan for each Day
07. Fully Randomized Examination with Negative Marking, which is Open Book and Open to Discussion among peer students / teachers
08. Online Certificate generation after student achieves minimum 40% score.
09. Very simple intuitive design which nurtures effective learning

Subject:
Anatomy/Physiology
Material Type:
Activity/Lab
Assessment
Diagram/Illustration
Full Course
Interactive
Module
Reading
Simulation
Textbook
Author:
Dr Arun Jamkar
Dr Manoj Killedar
Dr Sanjay VArade
Date Added:
12/11/2017
ASA Congruent Triangles
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that shows how triangles that have two angles and their included side the same must be congruent. The applet shows two triangles, one of which can be reshaped by dragging any vertex. The other changes to remain congruent to it and the two angles and the included side are outlined in bold to show they are the same measure and are the elements being used to prove congruence. The web page describes all this and has links to other related pages. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
Acid-Base Solutions
Conditions of Use:
No Strings Attached
Rating

How do strong and weak acids differ? Use lab tools on your computer to find out! Dip the paper or the probe into solution to measure the pH, or put in the electrodes to measure the conductivity. Then see how concentration and strength affect pH. Can a weak acid solution have the same pH as a strong acid solution?

Subject:
Chemistry
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Chris Malley
Kathy Perkins
Kelly Lancaster
Patricia Loeblein
Robert Parson
Date Added:
09/01/2010
Actin-myosin Crossbridge Animation
Conditions of Use:
Read the Fine Print
Rating

Roger Sabbadini, Ph.D., was the motivation behind this animation. The actin-myosin crossbridge system is complex, and we are really only speculating on the details in many ways. However, if a picture is worth a thousand words, this one second, 15 frame, animation is worth at least 15 thousand.

Subject:
Biology
Material Type:
Simulation
Provider:
Individual Authors
Provider Set:
Individual Authors
Author:
Jeff Sale
Roger Sabbadini
Date Added:
02/16/2011
Action Potential Experiments
Conditions of Use:
Read the Fine Print
Rating

Action Potential Experiments is a demonstration/simulation laboratory for neurophysiology based on the 'sodium theory' as originally formulated and tested by A. L. Hodgkin and his colleagues. The application includes simulations of the original experiments of Hodgkins and his colleagues, and of the classic voltage clamp and patch clamp experiments and an animated illustration of the 'sodium theory' explanation of Nernst potentials for potassium and sodium ions. The student can perform simple ion concentration experiments to test the predictions of the theory.

Subject:
Biology
Material Type:
Activity/Lab
Diagram/Illustration
Interactive
Lesson Plan
Simulation
Provider:
BioQUEST Curriculum Consortium
Provider Set:
The BioQUEST Library Online
Author:
Mark Bergland
Date Added:
04/25/2013
Acute Angle
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that demonstrate acute angles (those less than 90 deg). The applet presents an angle (initially acute) that the user can adjust by dragging the end points of the line segments forming the angle. As it changes it shows the angle measure and a message that indicate which type of angle it is. There a software 'detents' that make it easy capture exact angles such as 90 degrees and 180 degrees The message and angle measures can be turned off to facilitate classroom discussion. The text on the page has links to other pages defining each angle type in depth. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
Acute triangle
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that demonstrate the three types of triangle: acute, obtuse and right. The applet shows a triangle that is initially acute (all angles less then 90 degrees) which the user can reshape by dragging any vertex. There is a message changes in real time while the triangle is being dragged that tells if the triangle is an acute, right or obtuse triangle and gives the reason why. By experimenting with the triangle student can develop an intuitive sense of the difference between these three classes of triangle. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
Adhesion, Cohesion, and Surface Tension Demonstration
Conditions of Use:
Remix and Share
Rating

This short (<5-10 minutes) pair of demonstrations uses glass slides with a very thin film of water to demonstrate the cohesive and adhesive forces of water molecules, and a needle floating on water to demonstrate surface tension.

Subject:
Education
Hydrology
Material Type:
Activity/Lab
Simulation
Provider:
Science Education Resource Center (SERC) at Carleton College
Provider Set:
Starting Point: Teaching Entry Level Geoscience
Date Added:
11/07/2014
Adjacent Angles
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that show the concept of adjacent angles (two angles that share a common leg). The applet shows three line segments with a common endpoint. The user can move the center one and see that the angles on both sides (the adjacent angles) of it are affected. Applet can be enlarged to full screen size for use with a classroom projector. After use in the classroom, students can access it again from any web browser at home or in the library with no login required. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
Adjacent arcs
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that demonstrate the the concept of adjacent arcs. The user can 3 drag points around a circle that define the endpoints of two adjacent arcs. Web page has the properties of adjacent arcs. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
After Ellis Island
Conditions of Use:
Remix and Share
Rating

A PowerPoint presentation that takes students through a choose-your-own adventure style activity simulating the life choices of Jewish immigrants to the United States in the late 19th/early 20th century.

Subject:
Arts and Humanities
History
Social Science
Material Type:
Simulation
Author:
Troy Podell
Date Added:
03/16/2018
Algebra Tiles
Rating

Use tiles to represent variables and constants, learn how to represent and solve algebra problems. Solve equations, substitute in variable expressions, and expand and factor. Flip tiles, remove zero pairs, copy and arrange, and make your way toward a better understanding of algebra.

Subject:
Algebra
Material Type:
Diagram/Illustration
Interactive
Simulation
Author:
Illuminations National Council of Teachers of Mathematics
Date Added:
05/15/2018
All Systems are Go!
Conditions of Use:
Read the Fine Print
Rating

In this online activity, a fictional character, Arnold is missing a number of body parts. Students are presented with a body system and a variety of organs. Students drag and drop all the organs that belong in that particular body system to Arnold's body. Once all four systems are complete, a clothed Arnold will appear.Note: if students drag in an organ that doesn't belong, all the organs pop out and students have to start that system over. This exercise can also be found at Kineticcity.com under mind games.

Subject:
Anatomy/Physiology
Material Type:
Simulation
Teaching/Learning Strategy
Provider:
AAAS
Provider Set:
Science Netlinks
Date Added:
04/30/2007
Alpha Decay
Conditions of Use:
No Strings Attached
Rating

Watch alpha particles escape from a polonium nucleus, causing radioactive alpha decay. See how random decay times relate to the half life.

Subject:
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Danielle Harlow
John Blanco
Kathy Perkins
Noah Podolefsky
Ron LeMaster
Sam McKagan
Wendy Adams
Date Added:
07/21/2011
Alpha Decay (AR)
Conditions of Use:
Read the Fine Print
Rating

Watch alpha particles escape from a polonium nucleus, causing radioactive alpha decay. See how random decay times relate to the half life.

Subject:
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Danielle Harlow
John Blanco
Kathy Perkins
Noah Podolefsky
Ron LeMaster
Sam McKagan
Wendy Adams
Date Added:
09/02/2012
Alternate Exterior Angles
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that demonstrate the alternate exterior angles that are formed where a transversal crosses two lines. The applets shows the two possible pairs of angles alternating when in animation mode. By dragging the three lines, it can be seen that the angles are congruent only when the lines are parallel. When not in animated mode, there is a button that alternates the two pairs of angles. The text on the page discusses the properties of the angle pairs both in the parallel and non-parallel cases. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
Alternate Interior Angles
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that demonstrate the alternate interior angles that are formed where a transversal crosses two lines. The applets shows the two possible pairs of angles alternating when in animation mode. By dragging the three lines, it can be seen that the angles are congruent only when the lines are parallel. When not in animated mode, there is a button that alternates the two pairs of angles. The text on the page discusses the properties of the angle pairs both in the parallel and non-parallel cases. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
Amplification of Biochemical Signals: the ELISA Test
Conditions of Use:
Remix and Share
Rating

Students are introduced to the role of molecular shape, weak attractions and charge in biology and biochemistry, and then undertake a simulated Direct ELISA test.

Subject:
Chemistry
Physics
Material Type:
Activity/Lab
Assessment
Simulation
Provider:
Concord Consortium
Molecular Workbench
Provider Set:
Concord Consortium Collection
Date Added:
06/09/2005
Angle
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that introduce the concept of an angle. An angle made from two line segments is shown that the user can adjust by dragging the end points of the segments. In real time, as the angles is changed by the user, the angle measure in degrees is shown and a message telling what type of angle it currently is: acute, right, obtuse, reflex or straight. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
Angle bisector
Conditions of Use:
Read the Fine Print
Rating

An interactive applet and associated web page that demonstrate the bisector of an angle. An angle is shown using two line segments that can be dragged to change the angle measure. The angle is bisected by a line which moves while dragging to always divide the angle into two equal angles. The angle measures can be turned off for class discussions. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
Angle measure - degrees.
Conditions of Use:
Read the Fine Print
Rating

An interactive applet that acts as a 'digital manipulative' for explaining angles measured in degrees. The applet has an angle formed from two segment that can be dragged around in a circle. The angle measure is shown against a 'clock face' calibrated in degrees. The measures can be turned off for class angle estimation discussions. 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.

Subject:
Geometry
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
Animals in Motion
Rating

In this lesson, learners use a Flash animation running in a browser to study how animals and humans move. Students examine images captured by Eadweard Muybridge in the late nineteenth century; by starting, slowing, and stopping the animation, learners gain valuable insights into biomechanics of bipeds and quadrupeds.

Subject:
Education
Life Science
Biology
Astronomy
Material Type:
Activity/Lab
Diagram/Illustration
Interactive
Lesson Plan
Simulation
Unit of Study
Provider:
UCAR Staff
Provider Set:
Simplified Image Management and Processing Learning Environment for Science (SIMPLE Science)
Date Added:
11/02/2014
Animating Transformations
Rating

In most introductory linear algebra courses, prominent applications of transformations or mappings are moving (rotating, reflecting, translating), resizing (contracting, expanding), changing the shape (shearing, projecting) objects in the plane. A typical problem in such courses is to write the matrix of a transformation that changes points in such prescribed ways. The goal of this demo is to help students more easily visualize such transformations on a wide class of plane objects.

Subject:
Mathematics
Material Type:
Simulation
Provider:
Demos With Positive Impact
Provider Set:
Demos With Positive Impact
Author:
Hill, David R.
Roberts, Lila F.
Uebelacker, James
Whitley, Thurmon
Date Added:
01/24/2003