in school program has a provision stating that any movement of the body can be fixed only with respect to that body.This situation is called and the term "relativity of motion."The pictures of textbooks, it was clear that for standing on the river bank human speed sailing by boat consists of its speed and flow rate of the river.After this detailed examination, it is clear that the relative motion around us in all aspects of our lives.The speed of the object - relative, but a derivative of it, acceleration, also becomes a relative value.The importance of this finding is that it has accelerated as part of the formula Newton's second law (basic law of mechanics).Under this law, any force acting on the body, it gives him a proportional acceleration.The relative motion causes the additional question: with respect to a body attached to the acceleration?
In this law there is no explanation in this regard, but by simple logical reasoning can conclude that, because the force is a measure of the impact of the body (1) Other (2), this same power according to the body (2) accelerationrelative to the body (1) and not just an abstract acceleration.
relative motion - a particular trajectory of the dependence of a body, a certain way, the speed and movement of the selected frames.In the aspect of the kinematics of any applicable reference systems are equal, but all kinematic characteristics of the movement (trajectory, velocity, displacement) in them are different.All values depend on the chosen frame of reference by which to measure them will be produced, called relative.
relative motion, the definition of which is quite difficult to give without detailed consideration of other concepts, requires a precise mathematical calculation.To say that the body is moving or not, it can be when it is absolutely clear with respect to what (body count) changes its position.The reference system is a set of elements such as the body of reference, as well as the associated coordinate system and the system timing.With respect to these elements and consider the motion of any body or material points.Mathematically, the motion of an object (point) with respect to the chosen reference system is described by setting out how the change in time coordinates that define the position of an object in the system.Such equations, determines the relative movement, called the equations of motion.
In modern mechanics, any movement of the object is relative, so it should be considered only in relation to another object (body count) or the whole system of bodies.For example, you can not simply state that the moon moves at all.The correct statement is that the Moon moves relative to the Sun, the Earth, the stars.
often in mechanics and relativity theory link the frame of reference is not to the body, and with a continuum of basic objects (real or imagined) that define the coordinate system.
in movies often show relative motion of different bodies.For example, in one shot shows a train that travels on a background of a landscape (a movement relative to the surface of the Earth), and the next - a compartment of the car, the windows of which flashed the trees (with respect to the movement of the car).Any movement or rest of the body, which is a special case of motion relative.Therefore, in response to a simple question, is moving or at rest the body and how it moves, it is necessary to specify, with respect to any object considered his movement.Selection of frames are usually made according to the conditions of the problem posed.
