Energy is the ability of a body to modify the world around it . The unit in which energy is measured is the Joule (Jule).
In physics, kinetic energy is that which a body possesses due to its movement , and the speed achieved results from the amount of work necessary to accelerate a body of a given mass , starting from a rest position. It is symbolized as E c
What is kinetic energy?
Kinetic energy is the energy possessed by a body due to its movement . It is defined in physics as the work required for a body to accelerate from rest to a specific speed . When the body gets this energy, it stays on unless its speed changes. For the body to return to the rest state, a negative work with the same magnitude as the kinetic energy is necessary to slow it down.
How does kinetic energy work?
When a body is in motion it is because it has kinetic energy. If it collides with another object, it can transfer this energy to it, for this reason the second object will also move. For a body to acquire motion or kinetice energy, work or force must be applied to it .
The greater the time in which the force acts, the speed reached by the moving object and its kinetics energy will be greater. Mass is also related to the energy of motion. The more mass the body has, the kinetices energy increases . It can be easily transformed into heat or other kinds of energy.
Characteristics of kinetic energy
- It is one of the manifestations of energy.
- It is transferable from one body to another.
- It can be transformed into other kinds of energy; for example, in heat energy .
- You have to apply force to start the movement.
- It depends on the speed and the mass of the body .
Ratio of Kinetic Energy to Potential Energy
The sum of the kinetic energy with the potential energy results in mechanical energy (energy that relates the position of bodies with their movement). Kinetics, as already mentioned, refers to movement; while the potential refers to the amount of energy stored inside the body at rest.
So the potential energy will depend on the position of the object or system with respect to the force field around it . The kinetice energy depends on the movements that the object undertakes.
examples of kinetic energy
To understand how kinetic energy is generated and acts, we will mention some examples:
- Throw a ball into the air : To throw a ball it is necessary to put force on it. When we do, it acquires kinetic energy. To stop it, it will be necessary for another person, when stopping it, to compensate with a job of similar magnitude.
- The movement of a car in a roller coaster : This is one of the most classic examples of movement. The car on top has potential (reserve) energy . As it begins to fall, its mass and speed give it increasing kinetice energy. The energy will increase if the car is full, since the mass will be greater.
- Knock a body to the ground : If you run towards an object colliding with it, the movement energy gained from running overcomes the inertia of the body and it is knocked down. When the two bodies fall, they add the joint kinetic energy and it will be the ground that finally stops the movement.
- Water dam : The principle of hydraulic power combines both potential and kinetice energies; a dam contains large volumes of water (potential energy) until the moment we release it, it starts to run (kinetice energy) and turns a hydraulic turbine so that it allows us to generate electricity.