## Fact sheet: Conversion factors for changing units (Wikipedia)

August 26, 2010 by

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Well organized tables showing conversion factors for a lot of different units. For example, if you need to know * how many feet in one kilometer * how many Newtons are in one pound * how many cubic feet are in a cubic meter Look in the table for Length for the first, the table for Force for the second, and the table for Volume, for the third, and so on.

## Fact sheet: Physical constants

August 25, 2010 by

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Well organized tables showing the names, symbols, and magnitudes for most of the physical constants you'll ever need to us There are many physical constants in science, some of the most widely recognized being the speed of light in vacuum c, the gravitational constant G, Planck's constant h, the electric constant ε0, and the elementary charge e. Physical constants can take many dimensional forms: the speed of light signifies a maximum speed limit of the universe and is expressed dimensionally as length divided by time; while the fine-structure constant α, which characterizes the strength of the electromagnetic interaction, is dimensionless.

## Interactive java app: Zoom in by powers of ten down to the nanoscale

August 25, 2010 by

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Interactive java app that let's you zoom in and out from the cosmic scale down to the nanoscale. Good for practicing scientific notation and Greek prefixes. View the Milky Way at 10 million light years from the Earth. Then move through space towards the Earth in successive orders of magnitude until you reach a tall oak tree and move from the actual size of a leaf into a microscopic world that reveals leaf cell walls, the cell nucleus, chromatin, DNA and finally, into the subatomic universe of electrons and protons

## Fact sheet: The Scale of things

August 24, 2010 by

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Well organized graphic showing how large and small numbers are used to describe the real world. Shows pictures of objects along side of the order of magnitude of their sizes. Good for getting a feel for how the numbers are used and for making these small and large sizes comprehensible.

## Downloadable simulation: Periodic table in 3D (Mathematica)

August 24, 2010 by

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Downloadable simulation showing periodic trends in the properties of elements in a novel way. Good for seeing how electronegativity, atomic radius, and so on, change across groups and periods. This Demonstration shows 3D bar charts of the periodic table with various element property values

## Downloadable game: Build the periodic table (Mathematica)

August 23, 2010 by

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Downloadable game that lets you drill on the periodic table, position of the elements, and the types of elements. To put an element of the periodic table into the right place, first click a numbered box and then click the element. To remove an element from the table, click it again (hint: colors can be useful)Good experience for constant acceleration problems. The zero is when a body in free fall, say, crosses the origin of your coordinate system.

## Fact sheet: Orders of magnitude in lengths (Wikipedia article)

August 23, 2010 by

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Well organized tables showing how large and small numbers are used. Table showing how nanometer, millimeter, killometer, etc. relate to each other and to real physical objects. Good for getting a feel for how the numbers are used and for making these small and large sizes comprehensible.