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Free-motion quilting is a process used to stitch the layers of a quilt together using a domestic sewing machine with the feed dogs lowered, with a darning foot installed. When the feed dogs are lowered they do not advance the fabric ; and with the darning foot merely hovering over the layers, the operator controls the stitch length as well as ...
Atwood's machine is a common classroom demonstration used to illustrate principles of classical mechanics. The ideal Atwood machine consists of two objects of mass m1 and m2, connected by an inextensible massless string over an ideal massless pulley. [1] Both masses experience uniform acceleration. When m1 = m2, the machine is in neutral ...
A sewing machine is a machine used to sew fabric and materials together with thread. Sewing machines were invented during the first Industrial Revolution to decrease the amount of manual sewing work performed in clothing companies. Since the invention of the first sewing machine, generally considered to have been the work of Englishman Thomas ...
v. t. e. In continuum mechanics, stress is a physical quantity that describes forces present during deformation. For example, an object being pulled apart, such as a stretched elastic band, is subject to tensile stress and may undergo elongation. An object being pushed together, such as a crumpled sponge, is subject to compressive stress and ...
The quilts of Gee's Bend are quilts created by a group of women and their ancestors who live or have lived in the isolated African-American hamlet of Gee's Bend, Alabama along the Alabama River. The quilting tradition can be dated back to the nineteenth century and endures to this day. The residents of Gee’s Bend, Alabama, are direct ...
There are two main descriptions of motion: dynamics and kinematics.Dynamics is general, since the momenta, forces and energy of the particles are taken into account. In this instance, sometimes the term dynamics refers to the differential equations that the system satisfies (e.g., Newton's second law or Euler–Lagrange equations), and sometimes to the solutions to those equations.
The capstan equation[ 1 ] or belt friction equation, also known as Euler–Eytelwein formula[ 2 ] (after Leonhard Euler and Johann Albert Eytelwein), [ 3 ] relates the hold-force to the load-force if a flexible line is wound around a cylinder (a bollard, a winch or a capstan). [ 4 ][ 1 ] It also applies for fractions of one turn as occur with ...
Harriet Powers (October 29, 1837 – January 1, 1910) [1] was an American folk artist and quilter born into slavery in rural northeast Georgia. Powers used traditional appliqué techniques to make quilts that expressed local legends, Bible stories, and astronomical events. Powers married young and had a large family.