Adding Vectors - Components of Vectors
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Force and Mass
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Bohr's Explanation of the Hydrogen Spectrum
In 1915, Danish physicist Niels Bohr proposed that electrons orbit the nucleus of an atom at fixed energy levels, and that orbits further from the nucleus have higher energy levels. Electrons emit energy in the form of light when they return to a lower energy level. 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 ...
The Gravitational Force
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The Normal Force
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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 ...
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 ...
Force Vectors
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Average Velocity and Instantaneous Velocity
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