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1) "Barbell" -- As to barbell curl bar·bell
Pronunciation: 'bär-"bel
Function: noun
: a bar with adjustable weighted disks attached to each end that is used for exercise and in weight lifting Pronunciation Symbols
A U.S. Army soldier uses a barbell with Olympic plates (but no collars) to perform a bench press. He is accompanied by a spotter. A barbell is a piece of exercise equipment used in weight training, weightlifting and powerlifting. It consists of a steel bar that is 5 to 7 feet (approx. 2 metres) long. The central portion is one inch (2.54 cm) in diameter, and is engraved with a knurled crosshatch pattern to help lifters get a good grip. Cast iron disc weights (plates) are slid onto the outer portions of the barbell to obtain the desired total weight. These weights are often secured with collars to prevent them from sliding off during the exercise (which can result in injuries). There are two types of plates, and therefore two types of barbells: - Olympic plates have a central hole that is two inches (51 mm) wide. The outer portions of Olympic barbells are also two inches wide. Seven foot Olympic barbells weigh 20 kg, roughly equivalent to 45 lb.
- Standard plates have a central hole that is one inch (25 mm) wide. Standard barbells are one inch wide all the way along. Standard barbells typically weigh 10 kg, roughly equivalent to 22 lb.
In the sport of weightlifting, a specially designed barbell with rotating sleeves is used in conjunction with rubber "bumper" plates. The barbell is designed to withstand thousands of drops onto a lifting platform from as high as arms-length overhead without bending or breaking; the rubber plates allow it to absorb the impact of the drop, helping to prevent damage to the barbell and the dropping surface. The rotating sleeves specifically allow the barbell to be used with the Olympic lifts, which involve dropping under a rising barbell while still remaining in contact with it—a movement that could damage the wrists if the central portion of the barbell could not rotate independent of the weight sleeves on each end. Exercises that can be performe..."
2) "Curl" -- As to barbell curl 1curl
Pronunciation: 'k&r(-&)l
Function: verb
Etymology: Middle English, from crul curly, probably from Middle Dutch; akin to Old High German krol curly
transitive verb
1 : to form (as the hair) into coils or ringlets
2 : to form into a curved shape : TWIST <curled his lip in a sneer>
3 : to furnish with curls
intransitive verb
1 a : to grow in coils or spirals b : to form ripples or crinkles <bacon curling in a pan>
2 : to move or progress in curves or spirals : WIND <the path curled along the mountainside>
3 : TWIST, CONTORT
4 : to play the game of curling Pronunciation Symbols
In vector calculus, curl is a vector operator that shows a vector field's rate of rotation: the direction of the axis of rotation and the magnitude of the rotation. It can also be described as the circulation density. "Rotation" and "circulation" are used here for properties of a vector function of position; they are not about changes with time. A vector field which has zero curl everywhere is called irrotational. - 1 Definition
- 2 Usage
- 3 Examples
- 4 See also
- 5 External links
| The curl of a vector field is defined as the limit of the ratio of the surface integral of the cross product of with the normal of closed surface S, over a closed surface S, to the volume V enclosed by the surface S, as the volume goes to zero: More precisely, at each point p in three dimensional space, is given by the above limit, where the closed surfaces S all enclose p and the diameter, not just the volume, of the region enclosed by S tends to zero. This definition isn't very useful, and following alternative equivalent definition gives better measures to calculate components of .
The component of in the direction of unit vector is the limit of a line integral per unit area of over a closed curve C which encloses surface S, which is in a plane normal to :
Now to calculate components of for example in Cartesian coordinates, replace with unit vectors i, j and k.
The alternative terminology ``rotor" and alternative notation are often used for ``curl" and .
In mathematics the curl is noted by: where F is the vecto..."
Further Data On Term for barbell curl
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