This model is applicable to a single point particle moving with constant velocity. It is a subclass of the One-Dimensional Motion with Constant Acceleration model defined by the constraint a = 0.

For pure kinematics problems, the problem will often explicitly state that the velocity is constant, or else some quantitative information will be given (e.g. a linear position versus time plot) that implies the velocity is constant.

None.

• [position (one-dimensional)]
• velocity

A single point particle (or a system treated as a point particle with position specified by the center of mass).

In order for the velocity to be constant, the system must be subject to no net interaction.

If we plot position vs. time for constant velocity the result is a straight line having slope v and an intercept at t = t_i of v_i . If the velocity is positive, then the graph will rise with increasing time (as shown above). If the velocity is in the negative direction, the graph will fall with increasing time.

The intercept with the time axis will occur at t - t_i = -(x_i/v .