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Levers

Lever

1. (Science: mechanics) a rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied; used for transmitting and modifying force and motion. Specif, a bar of metal, wood, or other rigid substance, used to exert a pressure, or sustain a weight, at one point of its length, by receiving a force or power at a second, and turning at a third on a fixed point called a fulcrum. It is usually named as the first of the six mechanical powers, and is three kinds, according as either the fulcrum f, the weight W, or the power P. Respectively, is situated between the other two, as in the figures.

2. (Science: machinery) a bar, as a capstan bar, applied to a rotatory piece to turn it. An arm on a rock shaft, to give motion to the shaft or to obtain motion from it. Compound lever, a machine consisting of two or more levers acting upon each other. Lever escapement. See escapement. Lever jack. See jack. Lever watch, a watch having a vibrating lever to connect the action of the escape wheel with that of the balance. Universal lever, a machine formed by a combination of a lever with the wheel and axle, in such a manner as to convert the reciprocating motion of the lever into a continued rectilinear motion of some body to which the power is applied.

Origin: oe. Levour, OF. Leveor, prop, a lifter, fr. F. Lever to raise, L. Levare; akin to levis light in weight, E. Levity, and perh. To E. Light not heavy: cf. F. Levier. Cf. Alleviate, Elevate, Leaven, Legerdemain, levy.


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Re: mutations and dependencies

... also think of the specific function as an interaction of vague functions. Many complicated machines are actually made of relatively simple parts. Levers, wheels, axles, and pulleys aren't very complex on their own, but you can use them to make complicated things. The similar concept articulated ...

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by wildfunguy
Sun Feb 17, 2013 8:33 pm
 
Forum: Evolution
Topic: mutations and dependencies
Replies: 29
Views: 21275

Re: (Facilitated Diffusion), Carrier protein.

... enough, you need some significant force. If the energy barrier is low enough, a little thermal wiggle might be sufficient. You've encountered levers (perhaps electrical switches) that contain a spring so that the lever can be on one end-position or the other (say, left or right) but you must ...

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by jonmoulton
Fri Jun 24, 2011 4:29 pm
 
Forum: Cell Biology
Topic: (Facilitated Diffusion), Carrier protein.
Replies: 3
Views: 8770

Is abiogenisis natuarally possible?

... all on its own?!! Intelligent Design does become very tempting! I can see why some folk just can't believe there wasn't someone pulling nano-levers!! The cell really is a seriously impressive piece of natural engineering. :)

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by Julie5
Tue Dec 14, 2010 8:53 am
 
Forum: Evolution
Topic: Is abiogenisis natuarally possible?
Replies: 10
Views: 10921

Please help me calculate velocity.

Is this assuming the ball describes a simple arc centered on the shoulder? That's not how a ball is thrown, there are a bunch of levers moving at different speeds - just watch a video and try to figure out how much comes from the shoulder, the elbow, the twist of the forearm, the wrist, ...

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by Darby
Sat Oct 09, 2010 2:29 pm
 
Forum: Physiology
Topic: Please help me calculate velocity.
Replies: 3
Views: 5482

The Colin Leslie Dean species paradox

... nerves and synapses. Another disagreed, and exclaimed that it had to have been a mechanical engineer who designed the human body. The system of levers and pulleys is ingenious. "No," the third student said, "you're both wrong. The human body was designed by an architect. Who else ...

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by futurezoologist
Fri Jun 12, 2009 12:33 pm
 
Forum: Evolution
Topic: The Colin Leslie Dean species paradox
Replies: 135
Views: 173003
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