MECHANICS

Mechanics help explain how the natural forces of nature work. Here you can learn about everything from gravity to friction.
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Inertia

Inertia, the tendency of an object at rest to remain at rest and of an object in motion to remain in motion.

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  • How Newton’s Cradles Work

    How Newton’s Cradles Work

    Five metallic balls on slender threads sit side by side. As one on the end hits the rest, the one on the opposite end rises and falls. Why don't the balls in the middle move? It's complicated. See more »

  • Air

    Air

    Air, the mixture of gases that surrounds the earth and forms the earth's atmosphere. See more »

  • Ballistics

    Ballistics

    Ballistics, the science that deals with the motion of projectiles such as bullets, shells, rockets, and aerial bombs. See more »

  • Falling Bodies

    Falling Bodies

    Falling Bodies, objects moving downward under the influence of gravity. The nature of this motion is the same for an object that falls straight down as it is for one that moves forward and down at the same time. See more »

  • Force

    Force

    Force, in physics, the pushing or pulling agency that makes (or tends to make) objects speed up, slow down, or change direction. See more »

  • Friction

    Friction

    Friction, the force or resistance that opposes the movement of one body or substance against another. See more »

  • Hydromechanics

    Hydromechanics

    Hydromechanics, the branch of physics that deals with forces acting upon and within fluids (liquids and gases). See more »

  • Lever

    Lever

    Lever, a rigid rod or bar to which a force may be applied to overcome a resistance. See more »

  • Pendulum

    Pendulum

    Pendulum, an object connected to a fixed support in such a way that it is free to swing back and forth under the influence of gravity. See more »

  • Siphon

    Siphon

    Siphon, a bent tube used to move a liquid over an obstruction to a lower level without pumping. See more »

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