Kinetic energy

Kinetic energy is the energy that moving bodies have and is defined by the formula:

$E_{c} = \frac{1}{2} \cdot m \cdot v^{2}$

(1)

The unit of kinetic energy is 1J, just like any other form of energy.

It is no coincidence that the formula for defining kinetic energy is identical to the expression for the mechanical work required to accelerate a mass body m, from the state of rest to the state of motion with speed v.

Example: a mass body m=1kg is at rest and to bring it into motion with velocity v=10m/s a mechanical work must be done L= 50J. The energy consumed in this mechanical action will be found in a form of energy called kinetic energy, which has the value Ec= 50J. This kinetic energy is conserved as long as the body remains in this state of motion. By braking it to rest, the energy accumulated in this mode is restored.