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What is Energy?

Energy is a scalar quantity, it is defined as the ability to do work. Energy can be converted into many different forms.

 

Kinetic Energy

The energy of a particle in motion is defined as Kinetic Energy (K). When an object is stationary, its kinetic energy is zero. And, when the object is moving faster, its kinetic energy is more.
 


For an object having mass , and speed .

 

Potential Energy

Potential energy is the energy that can be associated with the arrangement of a system of forces.

 

Gravitational Potential Energy

The energy due to the state of separation between objects that attract each other by the gravitational force.
 


For an object having mass , and height , with gravitational acceleration .

 

Elastic Potential Energy

The energy due to the state of compression or extension of an elastic object.
 

 


For an object having spring constant , and elongation .

 

Energy Questions & Answers – Sample

Question 1: Find the kinetic energy of an object having a mass of 10 kg, and a velocity of 4 meters per second.

 

Explanation: We have given mass and velocity, let us apply the formula.

So, 

And, we have ,
 


Final answer: The kinetic energy would be .

 

Question 2: Calculate the potential energy of an object on earth, having a mass of 20 kg, with a height of 5 meters.  

 

Explanation: We will use the gravitational potential energy equation . And, acceleration due to gravity would be
 


Final answer: The gravitational potential energy would be .

 

Question 3: Calculate the potential energy stored on the spring due to compression of 0.5 meters. The spring constant is .


Explanation: We will use the elastic potential energy equation .
 


Final answer: The elastic potential energy would be .
 

 

The Concept of Energy Conversion made easy by the Best Physics experts

We often come across the statement that energy can neither be created nor destroyed.  Whether you study energy in school or college, it never fails to reveal some fascinating science facts. And the most important law of the topic remains the Law of Conservation of Energy.
 

But have you ever wondered where does all the energy come from and all the energy goes? How does one form of energy convert into another within a blink of an eye? Interesting, isn’t it!
 

The easiest definition of energy is that it is the ability to do work. It is categorized into potential and kinetic energy. Often, you kick a football and switch on your room light. You play your favorite songs on the music system or do something as simple as running. All the above-mentioned processes involve some energy conversion. One form of energy converts into another always for the successful completion of all the processes that happen around us in our daily lives.
 

Such is the significance of energy in our lives that there isn’t one process that does not involve one form of energy or its conversion into another. And once you have a great understanding of how a combination of different forms of energy can be utilized, you can do wonders in science.
 

This is what we are here for. Our helpers assist you to relate by giving daily life examples of energy so that you gain an in-depth knowledge of your subject. With the easy, stepwise instructions given by our learned tutors, you understand the concepts better and are all set to get good grades.
 

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How to get help in solving problems related to energy conversion?

 

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Frequently Asked Questions

 

 

What is energy formula?


Following are some basic formulas used to calculate energy.  

 

Gravitational Potential Energy: The energy stored in a system due to its vertical position.  <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>E</mi><mi>p</mi></msub><mo>=</mo><mi>m</mi><mi>g</mi><mi>h</mi></math>

 

Kinetic Energy: The energy due to the motion of an object.  <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>E</mi><mi>k</mi></msub><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mi>m</mi><msup><mi>v</mi><mn>2</mn></msup></math>

 

Elastic Potential Energy: The energy stored in spring due to its elongation.  <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>E</mi><mi>e</mi></msub><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mi>k</mi><msup><mi>e</mi><mn>2</mn></msup></math>

 

What is the difference between work and energy in physics?


Work is defined as an acton done on an object that caused the displacement of the object. Work can only be done when there is a displacement of the object.


However, energy can be considered as a property of a system, that can be transferred into another system by doing work.


What are forms of energy?


There are different forms of energy that exist, it could be broadly classified into potential energy and kinetic energy.

 

Potential Energy: It is stored energy, and this energy is due to position.

 

Gravitational Energy, Chemical Energy, Nuclear Energy, Mechanical Energy.

 

Kinetic Energy: Energy due to motion of particle, object, or system.

 

Thermal Energy, Sound Energy, Electrical Energy, Electromagnetic Energy.

 

What is chemical energy?


Chemical energy is a type of potential energy, that is stored between bonds of molecules and atoms.

 

Some examples of sources of chemical energy are petroleum, natural gas, coal, biomass.

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