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Kinematics is a branch of classical mechanics that describes the motion of points, bodies (objects), and systems of bodies without considering the mass of each or the forces that caused the motion. Kinematics, as a field of study, is often referred to as the "geometry of motion" and is occasionally seen as a branch of mathematics. A kinematics problem begins by describing the geometry of the system and declaring the initial conditions of any known values of position, velocity and/or acceleration of points within the system. Then, using arguments from geometry, the position, velocity and acceleration of any unknown parts of the system can be determined. The study of how forces act on masses falls within kinetics, not kinematics. For further details, see analytical dynamics.

### Etymology of the term

### Kinematics of a particle trajectory in a non-rotating frame of reference

### Velocity and speed

### Particle trajectories in cylindrical-polar coordinates

### Point trajectories in a body moving in the plane

### Pure translation

### Rotation of a body around a fixed axis

### Point trajectories in body moving in three dimensions

### Kinematic constraints