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  2. History of mineralogy - Wikipedia

    en.wikipedia.org/wiki/History_of_mineralogy

    For example, Pliny devoted five entire volumes of his work Naturalis Historia (77 AD) to the classification of "earths, metals, stones, and gems". [6] He not only describes many minerals not known to Theophrastus, but discusses their applications and properties.

  3. Theory of impetus - Wikipedia

    en.wikipedia.org/wiki/Theory_of_impetus

    If a force acts on a moving or stationary body, this leads to a change in the observed speed. The state of rest is merely a limiting case of motion. The term “impetus” as a force that maintains motion therefore has no equivalence in modern mechanics. At most, it comes close to the modern term “linear momentum” of a mass.

  4. Fictitious force - Wikipedia

    en.wikipedia.org/wiki/Fictitious_force

    This inward acceleration is called centripetal acceleration, it requires a centripetal force to maintain the circular motion. This force is exerted by the ground upon the wheels, in this case, from the friction between the wheels and the road. [21] The car is accelerating, due to the unbalanced force, which causes it to move in a circle.

  5. Rock (geology) - Wikipedia

    en.wikipedia.org/wiki/Rock_(geology)

    Most rocks contain silicate minerals, compounds that include silica tetrahedra in their crystal lattice, and account for about one-third of all known mineral species and about 95% of the earth's crust. [6] The proportion of silica in rocks and minerals is a major factor in determining their names and properties. [7]

  6. Newton's laws of motion - Wikipedia

    en.wikipedia.org/wiki/Newton's_laws_of_motion

    When a body is in uniform circular motion, the force on it changes the direction of its motion but not its speed. For a body moving in a circle of radius r {\displaystyle r} at a constant speed v {\displaystyle v} , its acceleration has a magnitude a = v 2 r {\displaystyle a={\frac {v^{2}}{r}}} and is directed toward the center of the circle.

  7. Metamorphic rock - Wikipedia

    en.wikipedia.org/wiki/Metamorphic_rock

    The middle continental crust is dominated by metamorphic rock that has reached the amphibolite facies. [26] Within the upper crust, which is the only part of the Earth's crust geologists can directly sample, metamorphic rock forms only from processes that can occur at shallow depth.

  8. Friction - Wikipedia

    en.wikipedia.org/wiki/Friction

    The backward-acting force of pressure exerted on the front surface is thus larger than the force of pressure acting on the back. Hence, as the resultant of the two forces, there remains a force that counteracts the motion of the plate and that increases with the velocity of the plate. We will call this resultant 'radiation friction' in brief."

  9. Sailing stones - Wikipedia

    en.wikipedia.org/wiki/Sailing_stones

    Sailing stones (also called sliding rocks, walking rocks, rolling stones, and moving rocks) are part of the geological phenomenon in which rocks move and inscribe long tracks along a smooth valley floor without animal intervention. The movement of the rocks occurs when large, thin sheets of ice floating on an ephemeral winter pond move and ...

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