Energy Explained! Easy Study From A Physicist


In physics, energy is a feature that must be transferred to an object to perform work or to be heated. It can be converted into another form but cannot be created or destroyed. Energy explained by physics is the easiest way to learn. In other words, energy is the ability to do work. This general definition is part of the basic definitions of modern physics that should answer the origin of natural phenomena of action, action, and force. Energy explained, by any physical system. A physical system’s energy is mechanical work that a system can produce when it changes its current state to a new state. It is a scalar quantity, E, and the unit is [J] Joule.

The term comes from the Greek word energy (Greek ένέργεια), which means lively. According to history, it probably appeared in the work of Aristotle in the 4th century BC. Energy is noticeable effects on bodies or the state of various systems. If something changes, some form of energy is responsible for such a change. Since we can store energy in the object’s body, a few effects appear. Such effects appear in various forms; examples are electricity obtained from batteries, the chemical energy stored in food, the thermal energy of water heaters, or the kinetic energy of a moving train. Simply put, energy is “change or the ability to change.”

Mechanical Energy Explained

Mechanical energy explained by physics with an example is the best way to learn. For example, let’s drop the ball from a certain height. When the ball fell from a height of һ_1, fell on the sand, it made a hole in the sand – and it deformed and performed work. The higher the altitude from which the ball falls, the bigger the deformation it caused (Figure 1). We use physical quantity to explain the body’s ability to perform work. The more energy the body has, the greater the work it can do. Energy shows how much work the body can do. 

On the other hand, to raise the ball at height һ, we need work. Since the ball’s speed during lifting is a constant, the resultant force acting on it is equal to zero. This means that the force F by which we raise the ball by intensity equals the gravity force. Besides the force F is constantly in the same direction as the speed of the ball, the work it does on the ball {{A}_{1}}={F}{{h}_{1}} When we lift the ball to a higher height h2 with the same force, the work {{A}_{2}}={F}{{h}_{2}}

The loftier the height to which the ball is raised, the greater the work is done. But the higher the length from which it falls, the greater the sand’s deformation on which the ball fell. That means the energy was higher. The work done on the mass is equal to the change in its energy. This means that if the mass had energy E1 and after that, the work was done, it has energy E2. Energy and work have the same units of measurement.

Energy explained- Figure1


The unit of measurement in the SI system is the joule

All around you, you can notice how energy changes with work, for example, when you are on a trampoline, it will throw you to a higher height, which is more elastically deformed. The trampoline works on your body and gives it energy. When you fall on the trampoline again, you deform it – you work on it. The higher the length to which the handyman raises the hammer, the more work is done on it. As a result, the hammer will have more energy and will be able to do more work on the nail – it will drive it deeper into the board.

The energy in all the above examples is conditioned by the mechanical state of the body. For example, motion, position, elastic deformation so it is called mechanical energy. Thy to make a fan at home and see how energy works in your home. You can also make a fan from an empty plastic bottle. Place both fans in front of the house or on the terrace and monitor their behavior when the wind blows. Try to evaluate when it turns fast.

Kinetic Energy Explained

This is Kinetic energy explained by physics with a few examples. The nail enters the board when it’s hit with a hammer, and the tractor pulls the plows while plowing the field. The wind drives the windmill, while the water turns the blades of the mill wheel. In all these examples, the bodies work because they have energy based on their movement. This energy is called kinetic energy, and the notation is Ek.

In a windmill made of paper or a plastic bottle, blow first slowly, then harder. What do you notice? Explain how you started the windmill and how the work on it was done. When you blow in a windmill, you cut invisible air particles, which, like a jet of water that drives a mill wheel, hit the windmill. They make her turn. The harder you blow, the particles of God move towards the windmill. The more speed a body has, the more kinetic energy possesses.

For example, roll a tennis ball towards another stationary tennis ball. Describe what happened. What do you expect to happen if you roll a basketball instead of a tennis ball at approximately the same speed?

If the test is performed correctly, the moving tennis ball will stop after the collision, and the ball it hit will start moving at a speed approximately equal to the speed of the ball that hit it. When she rolls the basketball, she will continue to move after the collision. Both the tennis ball and the basketball possessed kinetic surgery due to their movement. Both had approximately the same speed, but the work they performed was not the same. The basketball did more work because it burst the speed of the ball it hit. A basketball has more mass than a tennis ball. Due to that, its kinetic energy is higher.

Bodies that have more mass have higher kinetic energy while moving at the same speed. The kinetic energy is expressed in joules. The complete formula for the kinetic energy of a body of mass t moving at speed V is {{E}_{k}}={m}{{V}^2}/2

Kinetic Energy explained

Potential Energy Explained

The falling ball’s energy on the sand, Figure 1, depends on the height to which it is raised. When it is allowed to fall from a height of һ2, which is greater than һ1, it will fall deeper into the sand. When lifting the ball, we use work on it. The type of energy possessed by the ball, which depends on the place where it is located, is called potential energy and is expressed by Ep. If you put the ball right on the surface of the sand, it is located at heights h = 0, does not fall, so it does not work. It means that it does not have potential energy concerning sand, i.e., then Ep = 0.

The energy of the ball depends on the height at which it is located. However, if you place this container on a table, and place another container with sand on the floor next to the table, the ball is located at the height h = 0. To the first container with sand, the sand in the second container is at a height other than zero. It means that the ball now has potential energy other than zero relative to the level of sand in the other vessel. The potential energy of the body depends on the choice of the level about which it is determined.

You can conclude that when determining the value of the potential energy of the body, it must be emphasized concerning which level it is done. This level is called the reference or comparison level. The potential energy of a ball also depends on its mass. A ball of greater mass leaves a deeper trace in the sand (does more work on the sand). The fall of the ball is caused by the force of gravity. As you know, this force is mostly a consequence of the gravitational action of the clicker and the Earth. Therefore, the corresponding potential energy is called gravitational potential energy.

Energy explained- Summary

This is very short and clear Potential and Kinetic energy explained by physics with a few examples. There are several types of energy explained in other articles. For example, everything you need to know about clean energy where clean, renewable energy explained. Finally, the last energy explained: Energy is the body’s ability to do work. This is the classic definition of energy, which is applicable in the world we live in, where masses are measured by kilograms, work and energy in joules, and speed in meters per second. If you want more examples about energy explained please write in the comment section. We would be more than happy to provide more examples.

Source Physics classroom.

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