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| | pendulum | (เพน'ดิวลัม) n. ลูกตุ้ม, สิ่งที่แกว่งไปมา |
| | | Exercise, Pendulum | ท่าบริหารหัวไหล่ [การแพทย์] | | simple pendulum | ลูกตุ้มอย่างง่าย, ระบบที่ประกอบด้วยวัตถุขนาดเล็ก แขวนด้วยเชือกเบา ความยาวคงตัว อีกปลายตรึงแน่น เมื่อดึงวัตถุให้เชือกทำมุมเล็ก ๆ กับแนวดิ่ง แล้วปล่อย วัตถุจะมีการเคลื่อนที่กลับไปกลับมา (แกว่ง) รอบตำแหน่งสมดุล (ดู restoring force ประกอบ) [พจนานุกรมศัพท์ สสวท.] |
| | | ตุ้มน้ำหนัก | (n) pendulum, Example: การเดินของนาฬิกาเชิงกลมาจากการเลื่อนลงของตุ้มน้ำหนัก หรือจากการที่สปริงซึ่งขดไว้คลายออก |
| | ตุ้มนาฬิกา | [tum nālikā] (n) EN: pendulum FR: pendule [ m ] |
| | | | ballistic pendulum | (n) a physical pendulum consisting of a large mass suspended from a rod; when it is struck by a projectile its displacement is used to measure the projectile's velocity | | clock pendulum | (n) a physical pendulum used to regulate a clockwork mechanism | | foucault pendulum | (n) pendulum with a long wire; can swing in any direction; the change in the swing plane demonstrates the earth's rotation | | gun pendulum | (n) a ballistic pendulum consisting of a suspended gun; the velocity of a projectile in the bore of a gun can be measured by the recoil when the gun is discharged | | pendulum | (n) an apparatus consisting of an object mounted so that it swings freely under the influence of gravity | | pendulum clock | (n) a clock regulated by a pendulum | | pendulum watch | (n) (18th century) a watch with a balance wheel having a fake pendulum attached to it | | physical pendulum | (n) pendulum consisting of an actual object allowed to rotate freely around a horizontal axis, Syn. compound pendulum | | simple pendulum | (n) a hypothetical pendulum suspended by a weightless frictionless thread of constant length | | ribbon fern | (n) epiphytic fern with straplike usually twisted fronds of tropical Asia and Polynesia and America, Syn. Ophioglossum pendulum |
| | Pendulum | 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 ] ☞ 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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| | 摆 | [bǎi, ㄅㄞˇ, 摆 / 擺] to arrange; to exhibit; to move to and fro; a pendulum #2,080 [Add to Longdo] | | 钟摆 | [zhōng bǎi, ㄓㄨㄥ ㄅㄞˇ, 钟 摆 / 鐘 擺] pendulum #60,069 [Add to Longdo] | | 傅科摆 | [Fù kē bǎi, ㄈㄨˋ ㄎㄜ ㄅㄞˇ, 傅 科 摆 / 傅 科 擺] Foucault's pendulum #455,245 [Add to Longdo] | | 摆钟 | [bǎi zhōng, ㄅㄞˇ ㄓㄨㄥ, 摆 钟 / 擺 鐘] pendulum clock [Add to Longdo] |
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