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pendulum    音标拼音: [p'ɛndʒələm]
n. 钟摆,摇锤

钟摆,摇锤

pendulum
n 1: an apparatus consisting of an object mounted so that it
swings freely under the influence of gravity

Hydrometer \Hy*drom"e*ter\, n. [Hydro-, 1 -meter: cf. F.
hydrom[`e]tre.]
1. (Physics) An instrument for determining the specific
gravities of liquids, and thence the strength spirituous
liquors, saline solutions, etc.
[1913 Webster]

Note: It is usually made of glass with a graduated stem, and
indicates the specific gravity of a liquid by the depth
to which it sinks in it, the zero of the scale marking
the depth to which it sinks in pure water. Extra
weights are sometimes used to adapt the scale to
liquids of different densities.
[1913 Webster]

2. An instrument, variously constructed, used for measuring
the velocity or discharge of water, as in rivers, from
reservoirs, etc., and called by various specific names
according to its construction or use, as {tachometer},
{rheometer}, {hydrometer}, {pendulum}, etc.; a current
gauge. Hydrometric


Pendulum \Pen"du*lum\, n.; pl. {Pendulums}. [NL., fr. L.
pendulus hanging, swinging. See {Pendulous}.]
A body so suspended from a fixed point as to swing freely to
and fro by the alternate action of gravity and momentum. It
is used to regulate the movements of clockwork and other
machinery.
[1913 Webster]

Note: The time of oscillation of a pendulum is independent of
the arc of vibration, provided this arc be small.
[1913 Webster]

{Ballistic pendulum}. See under {Ballistic}.

{Compensation pendulum}, a clock pendulum in which the effect
of changes of temperature of the length of the rod is so
counteracted, usually by the opposite expansion of
differene metals, that the distance of the center of
oscillation from the center of suspension remains
invariable; as, the {mercurial compensation pendulum}, in
which the expansion of the rod is compensated by the
opposite expansion of mercury in a jar constituting the
bob; the {gridiron pendulum}, in which compensation is
effected by the opposite expansion of sets of rods of
different metals.

{Compound pendulum}, an ordinary pendulum; -- so called, as
being made up of different parts, and contrasted with
{simple pendulum}.

{Conical pendulum} or {Revolving pendulum}, a weight
connected by a rod with a fixed point; and revolving in a
horizontal circle about the vertical from that point.

{Pendulum bob}, the weight at the lower end of a pendulum.

{Pendulum level}, a plumb level. See under {Level}.

{Pendulum wheel}, the balance of a watch.

{Simple pendulum} or {Theoretical pendulum}, an imaginary
pendulum having no dimensions except length, and no weight
except at the center of oscillation; in other words, a
material point suspended by an ideal line.
[1913 Webster]


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  • Pendulum - Wikipedia
    When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position When released, the restoring force acting on the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth
  • Pendulum | Definition, Formula, Types | Britannica
    A pendulum is a body suspended from a fixed point so that it can swing back and forth under the influence of gravity The time interval of a pendulum’s complete back-and-forth movement is constant
  • ‪Pendulum Lab‬ - PhET Interactive Simulations
    Explore pendulum motion, experiment with variables, and understand the physics behind periodic motion through this interactive simulation
  • Pendulum | The Next Generation of Probiotics
    Our first investor and continuing research partner We are the first consumer microbiome company to co-develop a registry with the Mayo Clinic Our team has served as board members for ADA chapters and the ADA Research Foundation Pendulum was profiled at the annual Scientific Sessions
  • Physics of a Pendulum: Types, Formulas, History Applications
    Pendulum is a simple way to show what periodic motions are like They may be as simple as a simple pendulum and more complex like Foucault’s pendulum or compound pendulum
  • PENDULUM Definition Meaning - Merriam-Webster
    The meaning of PENDULUM is a body suspended from a fixed point so as to swing freely to and fro under the action of gravity and commonly used to regulate movements (as of clockwork)
  • Simple Pendulum - Physics, Formulas, and Applications
    Learn about the simple pendulum, its physics, real-world behavior, and calculations Ideal for high school and college physics students
  • PENDULUM - Official Website
    Pendulum are undoubtedly one of the biggest electronic bands of all time With 3 platinum albums to their name including renowned debut ‘Hold Your Colour’ and a UK #1 and #2 for ‘Immersion’ and ‘In Silico’, the drum and bass rock band from Perth, Australia have sold over a million albums in the UK alone
  • What Is a Pendulum? Physics, History, and Types - ScienceInsights
    A pendulum is a weight suspended from a fixed point so that it can swing freely back and forth under the influence of gravity
  • myPhysicsLab Simple Pendulum
    Physics-based simulation of a simple pendulum Modify gravity, mass or friction (damping) Drag the pendulum to change the starting position Or click below to set initial conditions: The math behind the simulation is shown below Also available: source code, documentation and how to customize





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