In kinematics, both classical or relativistic, the center of mass coordinate system is a coordinate system in which the center of mass of the system remains still (it has no velocity). It is especially useful for the kinematic study of an assembly of particles. ...more on Wikipedia about "Center of mass coordinates"
A four bar linkage or simply a 4-bar or four-bar is the simplest movable linkage. It consists of 4 rigid bodies (called bars or links), each attached to two others by single joints or pivots to form a closed loop. ...more on Wikipedia about "Four bar linkage"
In physics, kinematics is the branch of mechanics concerned with the motions of objects without being concerned with the forces that cause the motion. In this latter respect it differs from dynamics, which is concerned with the forces that affect motion. ...more on Wikipedia about "Kinematics"
Mechanical linkages are a series of rigid links connected with joints to form a closed chain, or a series of closed chains. Each link has two or more joints, and the joints have various degrees of freedom to allow motion between the links. A linkage is called a mechanism if two or more links are movable with respect to a fixed link. Mechanical linkages are usually designed to take an input and produce a different output, altering the motion, velocity, acceleration, and applying mechanical advantage. ...more on Wikipedia about "Linkage (mechanical)"
In classical physics, a reaction is defined by Newton's third law that can be formulated like ...more on Wikipedia about "Reaction (physics)"
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