# Physics Linear Motion

Physics linear motion is motion along a straight line, and can therefore be described mathematically using only one spatial dimension. The linear motion can be of two types: uniform linear motion with constant velocity or zero acceleration; non uniform linear motion with variable velocity or non-zero acceleration. The motion of a particle along a line can be described by its position x, which varies with time t. An example of linear motion is an athlete running 100 m along a straight track.

Physics linear motion is the most basic of all motion. According to Newton’s first law of motion, objects that do not experience any net force will continue to move in a straight line with a constant velocity until they are subjected to a net force. Under everyday circomestances, external forces such as gravity and friction can cause an object to change the direction of its motion, so that its motion cannot be described as linear.

One may compare physics linear motion to general motion. In general motion, a particle’s position and velocity are described by vectors, which have a magnitude and direction. In linear motion, the directions of all the vectors describing the system are equal and constant which means the objects move along the same axis and do not change direction. The analysis of such systems may therefore be simplified by neglecting the direction components of the vectors involved and dealing only with the magnitude.

## Physics Linear Motion

### Physics Linear Motion

**Physics Linear Motion**

*Physics Linear Motion*

Physics Linear Motion

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