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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 | Definition, Formula, Types | Britannica
    Pendulum, body suspended from a fixed point so that it can swing back and forth under the influence of gravity Pendulums are used to regulate the movement of clocks, because the interval of time for each complete oscillation, called the period, is constant
  • 15. 5: Pendulums - Physics LibreTexts
    For small displacements, a pendulum is a simple harmonic oscillator A simple pendulum is defined to have a point mass, also known as the pendulum bob, which is suspended from a string of length L with negligible mass (Figure 15 5 1)
  • Simple Pendulum: Theory, Diagram, and Formula. - Science Facts
    A pendulum is a device that is found in wall clocks It consists of a weight (bob) suspended from a pivot by a string or a very light rod so that it can swing freely When displaced to an initial angle and released, the pendulum will swing back and forth with a periodic motion
  • Pendulums – The Physics Hypertextbook
    A pendulum is a mass suspended from a pivot point that is free to swing back and forth Because the motion is oscillatory (a fancy way to say back and forth) and periodic (repeating with a characteristic time), pendulums have been used in clocks since the 17th century
  • 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) How to use pendulum in a sentence
  • The Ultimate Guide to Understanding Pendulum Movements
    A pendulum consists of a mass (often called a bob) attached to a string or rod that swings back and forth around a pivot point The motion of a pendulum is influenced by gravitational force, tension in the string, and initial conditions such as the angle from which it is released
  • Pendulum Physics | Oscillation, Period Forces
    The study of pendulum physics encompasses a range of fascinating concepts, primarily oscillation, period, and the forces acting on the pendulum A simple pendulum consists of a weight, known as a bob, suspended from a fixed point by a string or rod, free to swing back and forth
  • Simple Pendulum - HyperPhysics
    A simple pendulum is one which can be considered to be a point mass suspended from a string or rod of negligible mass It is a resonant system with a single resonant frequency For small amplitudes, the period of such a pendulum can be approximated by:
  • How a Pendulum Works - Saint Marys University
    A pendulum consists of a mass suspended from a string that is fixed to a pivot The mass is free to swing back and forth, and rests at what we will call the “equilibrium position” We will say that the string has length L and the ball suspended from it has mass m
  • 16. 4: The Simple Pendulum - Physics LibreTexts
    Use a simple pendulum to determine the acceleration due to gravity \(g\) in your own locale Cut a piece of a string or dental floss so that it is about 1 m long Attach a small object of high density to the end of the string (for example, a metal nut or a car key)





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