# Correct terminology for combined kinematic and dynamic state

The kinematic state is defined as the position and orientation in space. The dynamic state is defined as the associated velocities.

What is the correct terminology for the combined kinematic and dynamic state? Can I call it the kinetic state?

The kinematic state involves all positions, velocities, accelerations, and orientations.

The kineto-static state involves the kinematics plus all inertial and applied forces.

The dynamic state is the integration of the kineto-static state over time.

See my answer here relating to the terminology.

• How is there any difference between dynamic and kinematic state according to your definitions?
– Ingo
May 2, 2014 at 8:13
• The kinematic state has no description for forces. It is simply a relationship of positions and orientations and their derivatives. Dynamic state involves solving for all the forces in the system. May 2, 2014 at 17:50

Yes. Two particles at a given position, one moving and the other at rest are having the same kinematic state. But dynamic state takes in the velocity. When you need to specify both position and velocity - it becomes kinetic state. After all kinematics + dynamics = Kinetics.

• I think kinematic state involves derivatives as well. Dynamics = kinematics + forces/torques. @ja72's answer seems more correct. Mar 28, 2017 at 21:13

After all kinematics + dynamics = Kinetics.

I agree wholeheartedly. Kinematics is a study of positions, velocities, accelerations, and orientations. In the F=MA and therefore, A=F/M, doesn't the A- accelerations include the implied force and mass required?

Please another stupid word for someone who doesn't understand physics equations?