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Reciprocating motion, also called reciprocation, is a repetitive up-and-down or back-and-forth linear motion. It is found in a wide range of mechanisms, including reciprocating engines and pumps. The two opposite motions that comprise a single reciprocation cycle are called strokes. [citation needed]
head banging, where the head is forcibly moved in a back and forth direction. head rolling, where the head is moved laterally while in a supine position. Other less common muscle movements include: body rolling, where the whole body is moved laterally while in a supine position. leg rolling, where one or both legs are moved laterally.
Other noted signs include rocking back and forth, fidgeting, and pacing. [7] However, not all observable restless motion is akathisia. For example, while mania, agitated depression, and attention deficit hyperactivity disorder may present like akathisia, movements resulting from them feel voluntary, rather than being due to restlessness. [17]
Scratching, sometimes referred to as scrubbing, is a DJ and turntablist technique of moving a vinyl record back and forth on a turntable to produce percussive or rhythmic sounds. A crossfader on a DJ mixer may be used to fade between two records simultaneously.
Then they reverberate back and forth like this about 10 times until the first ball stops connecting with the second ball. Then the reverberations reflect off the contact point between the second and third balls, but they still converge at the last contact point, until the last ball is ejected —but this is a lessening of a wavefront with each ...
Standing long jump performance is shown to be improved by swinging arms forward during the onset of the jump and back-and-forth during landing since the linear momentum of the body can be adjusted with the help of moving arms. [9] Use of arms in adjusting the rotational and linear momentum is also a common practice in somersaulting and gymnastics.
The rapid reiteration of a single note is a characteristic effect of bowed string instruments, obtained by rapidly moving the bow back and forth.However, the technique may be performed on any instrument on which it is practicable.
Tremolo - Chiefly used for orchestral playing, this consists of moving the bow back and forth in very short strokes extremely rapidly, not in precisely measured rhythm (usually at upper half of the bow). Col legno - Occasionally the strings are struck with the stick of the bow ("with the wood.") This gives a muted percussive sound, and is most ...