The human center of gravity is the point where the human body rests under normal conditions without rotating, remaining balanced without active effort to remain upright. An unstable center of gravity requires only a small push to ruin someone's equilibrium, whereas a stable equilibrium is much stronger and can remain stable even under significant force.
The natural center of gravity shifts according to posture, with a lower center of gravity, or CG, creating a stronger balance. Crouching, sitting and kneeling all create a stable CG, making it easy to remain balanced even when pushed by outside factors. Standing upright is less stable, as the CG is higher and easier to unbalance.
Center of gravity is only one part in maintaining balance, with several other factors determining if someone can remain upright. An individual will maintain balance with an increase of friction in their footing or being assisted by special footwear. Someone balancing on a rope or a wooden beam will crouch down to lower their center of gravity, actively equalizing their balance in the process. Individuals with greater mass have a stronger balance due to a more stable center of gravity, requiring less effort to remain upright than shorter or smaller people.Learn More
Rutherford’s atomic theory was that an atom had a central positive nucleus with negative electrons orbiting it. He developed this theory with his gold foil experiment.Full Answer >
The Danish physicist Niels Bohr developed a model of the atom that combined Ernest Rutherford's discovery of the nucleus with the quantum ideas proposed by Max Planck. This solved the problem of why the electrons did not immediately collapse into the nucleus. Bohr received the Nobel Prize in Physics for his discovery in 1922.Full Answer >
A proton is approximately 2,000 times heavier than an electron. Protons and electrons, along with neutrons, are the principal sub-atomic particles that make up an atom.Full Answer >
John Needham’s experiment involved placing a broth into a bottle, heating it and then sealing it. Days later, Needham found the presence of life, and eventually announced that life had been created from nonliving material. This supported the incorrect idea that life could come from nonliving things.Full Answer >