lever


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lev·er

(lev'ĕr, lēv'),
An instrument used to lift or pry.
[Fr. lever, to lift]

lever

[lē′vər, lev′ər]
Etymology: L, levare, to lift up
any one of the numerous bones and associated joints of the body that act as a simple machine so that force applied to one end of the bone tends to rotate the bone in the direction opposite from that of the applied force. The muscles of the body produce the forces that move the levers. The basic components of a lever are the fulcrum, the force arm, and the weight arm. A first-class lever, such as the joint between the base of the skull and the first cervical vertebra, has a fulcrum between the weight and the applied force. The body contains few second-class levers, which have the weight between the fulcrum and the force. A third-class lever, such as the forearm and elbow, has the force between the fulcrum and the weight. The body uses its third-class levers for speed and its first-class levers for either force or speed, depending on the force applied to the weight arm.

lev·er

(lev'ĕr)
An instrument used to lift or pry.
[Fr. lever, to lift]

lever (lev´ur),

n a bar or rigid body that is capable of turning about one joint or axis and in which are two or more other points where forces are applied. There are three classes of levers, and each has its own most effective use.
lever leverage
n the mechanical advantage gained by the use of a lever. A factor in the magnification of stresses generated by an extension-base partial denture.
lever, second-class,
n a lever in which the force arm is longer than the work-producing arm; thus the work produced is always greater than the energy used, with a resultant high efficiency.
lever, third-class,
n a lever in which the axis is at one end, the load at the other end, and the effort is exerted in between, as in a treadle.
References in periodicals archive ?
The victim also told the High Court in Edinburgh that Lever had engaged in a type of sexual activity she had not wanted and that "there was blood everywhere".
Within a pair the first value represented the probability of setting up a food pellet in the left lever, and the second value the probability of setting up a food pellet in the right lever.
For both lever-propulsion systems, the levers can be disengaged to allow the option of using the hand rims for propulsion.
Lever eventually pleaded guilty to charges of indecent assault and committing an act of gross indecency with or towards a child.
Lever actions generally can't match the quality trigger pull of a good bolt action.
Johnny Lever is an artist and comedian who has been specialising in making people laugh through his acting capabilities in films and television and stage shows.
Moving from flight range to ground range requires relatively long upward travel of the power levers.
Caption: Celebrating the confluence of art and architecture, RFR Realty held a broker event in the lobby of Lever House, 390 Park Avenue, on Tuesday May 11TH, 2010, attended by more than 150 real estate professionals.
The winner of the annual Lever Prize receives pounds 10,000 cash and a year of support from the North West's most influential business leaders.
My PH (professional hunter) rifle in Africa is a lever action.
Investigators discovered the T-38 aileron actuator lever, a flight control, was a contributing factor.