We explain what kinetic energy is. In addition, the difference between potential energy and kinetic energy, and some examples.
Kinetic energy is that energy that has a body or system due to its movement.
The physical defined as the amount of work needed to accelerate a body of mass determined and in the rest position, until reaching a certain speed. Once this point has been reached, according to the Law of inertia , the amount of accumulated kinetic energy will remain identical unless a change in speed occurs or the body returns to its resting state, after suffering a negative work of the same magnitude.
Kinetic energy is often represented by the symbol E c (which may be E + or E – , depending on the case), although sometimes the symbols T or K are also used . It is usually expressed in Joules (J).
It is possible to determine the kinetic energy of an object using various formulas in classical mechanics , such as: E c = (mv 2 ) / 2 where m is the mass (Kg) of the object and v its velocity (m / s). Thus, 1 J = 1Kg. 1m 2 / s 2 .
However, being related to speed, in relativistic mechanics it will not only depend on the nature of the object, but also on its relationship with the observer and with the inertial reference system. In a Cartesian plane , the formula would be as follows: E c = [m. (X 2 + Y 2 + Z 2 )] / 2.
In any case, this energy can be understood as the energy that prints the movement on the object , and can easily be transformed into heat or other forms of energy.
There are no proper types of kinetic energy, however each particular approach of physics presents its own perspective on it, for example:
The kinetic energy (E c ) and the potential energy (E p ), added together, make up the mechanical energy (E m ) of an object or system . However, they are distinguished in that while the first concerns the moving bodies, the second has to do with the amount of energy accumulated within an object at rest.
That said, the potential energy depends on how the object or system is positioned relative to the field of forces around it, while the kinetics has to do with the movements it undertakes.
There are three types of potential energy:
Some examples where the kinetic energy is verified can be:
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