IS INERTIAL FORCE A REAL FORCE

Newtonian three laws are well-known laws in the classical physics, but why the number of laws should be three could not been well taught in the common classes. In this paper, we provide an interesting interpretation for the public understanding of the logical integrity for Newtonian three laws. Force is a fundamental concept in Newtonian laws, but it has the same meaning in the inertial and non-inertial frames, which is different from Newtonian laws themselves since they hold only in inertial frame. Inertial force exists only in non-inertial frame and is regarded as fictional, since the origin of the force and its reaction cannot be found. In this paper, when the space-time is introduced to study the inertial force, it can implement the force and can be reacted, so inertial force is real. This provides a novel way to understand force beyond the Newtonian frame (in particular, it means the absolute space-time).