Kinetic energy definition, types, examples and easy formula

Kinetic energy
Kinetic Energy

Kinetic Energy/ Motion energy - The word "energy" is no stranger to the ears of people. For example, when we push a cart, play ball, open a door, and so on, there is energy.

The moving power of an object is the motion energy of that object. Its formula is closely related to potential energy and mechanical energy.

When an object possessed moving power, it means that it has motion energy, and it is another name of kinetic energy.

The kinetic word is originally from the Greek kinetikos which means to move. Therefore, from that, all moving objects have kinetic energy.

The value of kinetic energy is closely related to the mass and velocity of the object. The motion energy is directly proportional to the mass and also proportional to the square of the object's velocity.

Objects with enormous mass and velocity have large motion energy when moving, and objects whose mass and velocity are small, their kinetic energy is also small.

Another example you can also observe when you throw a stone. The stone you throw must have speed, and therefore it has motion energy. The motion energy of this stone you can see the impact when it hits the target in front of it.

        Types of Kinetic Energy 

There are various types of kinetic energy, namely:

• Radiation energy

Radiation energy is motion energy. This is because radiation itself experiences movement when changing its energy. For example, when you listen to the radio, you are using radiation energy.

• Heat energy

Heat energy is another type of energy-related to motion energy. When atoms and molecules move fastly and rub against each other, they produce heat energy. For example, when you feel the warmth of a campfire while camping.

• Sound energy

For example, when you listen to music through the speaker, there are components that vibrate and rub against each other, which produce motion energy, and it relates to motion energy.

• Electrical energy

Electrical energy is the movement of protons and positively charged electrons that move through wires. An example of this electrical energy is when you press the electric bell switch and the components inside the bell turn it into sound. This means there is a movement or transfer of energy in the component.

     Motion energy in Daily Life

To better understand, we will give several examples. Here is an example:

• River water that flows at a certain speed. Therefore, river water also has a density and speed, so including the required motion energy.

• when we throw a ball in the air from the earth or one place to another.

• When we pull the cupboard when moving it from room to room.

• Crawling babies. With speed and weight, the baby can move from one place to another.

• Athletes who swim. The existence of force or effort made by a swimmer to swim (move) from one place to another, it will require motion energy.

Kinetic Energy Formula (Translated Kinetic Energy)

This is the most basic motion energy formula and commonly referred to as motion energy alone.

Ek = ½ x m x v2

Information :

m = mass of rigid body (kg)
v = speed (m / s)
Ek = kinetic energy (Joule)

Rotational Kinetic Energy Formula

In fact, not all objects move in a linear transaction. There are also objects that move in circular or rotational movements.

The kinetic energy formula for this motion is commonly called the rotational kinetic energy formula, and its value differs from ordinary kinetic energy.

The parameters in rotational energy use a moment of inertia and angular velocity, The formula is this,

Er = ½ x I x ω2


I = moment of inertia
ω = angular velocity

So calculating the rotational kinetic energy you first need to know the moment of inertia and the angular velocity of the object.

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