The Standard Model of Particle Physics
The Standard Model of physics is similar to the periodic table of the elements, But instead of listing the chemical elements, it lists the fundamental particles that make up the atoms of the chemical elements. More ...
The Normal Force
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The Periodic Table of the Elements
The periodic table arranges all the known elements into rows (called periods) and columns (called groups). All elements in the same period have the same number of electron shells. Elements in the same group have the same number of valence electrons. More ...
Antimatter
Antimatter is a substance made up of subatomic particles that have the same mass as ordinary matter, but with opposite electric charge and parity. For example, an electron has a negative charge, while the positron, has a positive charge. More ...
Magnetic Fields
A magnet creates a magnetic field around it that describes the force exerted on other magnets placed in the field. As with electric fields, the pictorial representation of magnetic field lines is very useful for visualizing the strength and direction of the magnetic field. More ...
Quarks
Quarks and gluons are the building blocks of protons and neutrons, which in turn are the building blocks of atomic nuclei. They are the elementary particles in the present standard model. More ...
Force and Mass
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Vectors Position and Displacement
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How to Enrich Uranium
Uranium enrichment increases the percentage of uranium-235 (U-235) in uranium. Natural uranium has 0.7% U-235, while nuclear reactor fuel needs 3-5%. More ...
Multiplying Vectors
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