Displacement is the distance traveled between two points
Unconstrained movement in a mechanism means that one link is heldfixed and the movement of any other link to a new position will notcause each of the other links to move to definite predictable positions
A rigid link in a machine is a link whose deformations are sosmall that they can be neglected in determining motions of the various other links
A kinematic link consists of a number of pairs of elements connected by links
Coplanar motion refers to a body, or a seriesofbodies, where component particles are moving in the same plane or in a parallel plane
Velocity is the time rate of motion of a point along its path, or the rate at which a point is approaching or receding from another point in its path
Pure mechanism deals with the motions and forms of the parts of a machine, and the manner of supporting and guiding them, independent of their strength
A machine is a combination of resistant bodies arranged so that the mechanical forces of nature can be compelled to produce some effect or work accompanied with certain determinate motions
A link is any body which has motion relative to another, serving to transmit forces from one piece to another or to cause motion or control motion
A frame in a machine refers to the surfaces of contact between twopieces that have relative motion, one of which supports or partially supports the other
A higherpair in a mechanism refers to contact which exists at a point or along a line
Translation motion means a body has motion with the same velocity, as regards both speed and direction, when all its component particles have the same velocity
Machine design involves the calculation of the forces acting on different parts of the machine
Oscillation is a term applied to reciprocating circular motion, such as that of a pendulum
A path is a point moving in space that describes a line, which may be rectilinear or curvilinear
Continuous motion is when a point continues to move indefinitely in a given path in the samesense
Linear acceleration is the time rate of change of linearvelocity
A crank is part of a machine that is stationary and supports the moving members
Turningbodies in a machine may be defined as an arm rotating or oscillating about an axis
A closedpair in a mechanism is another term for a lower pair