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Definition: the process of burning something.
Formula: C3H8 + O2 = CO2 + H2O
Example: flame

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Definition: a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
Formula: N/A
Example:Crude oil, coal and gas are fossil fuels.

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Definition: A change from one form of energy to the other is energy transformation
Formula: N/A
Example: A toaster transforms thermal energy to thermal energy.

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Definition: Energy can neither be created nor destroyed; rather, it can only be transformed from one form to another
Formula:

Example:

When you push a book across the table, the energy from your moving arm is transferred from your body to the book, causing the book to move.

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Definition: a form of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space.
Formula: E=hv
Example: , ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.

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Definition: the energy released during nuclear fission or fusion, especially when used to generate electricity.
Formula: E=mc²
Example: nuclear power plant provides enough energy to give electricity to large cities.

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Definition: Chemical energy, Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat.
Formula: H₂(g) + 0.5 O₂ -> H₂O(l), dHf = -285.8 kJ/mol
Example: Coal, petroleum.

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Definition: Electrical energy is defined as an electric charge that lets work be accomplished.
Formula: Power P = E ⁄ t
(where power P is in watts, Power P = work / time (W ⁄ t).Energy E is in joules, and time t is in seconds.)
Example: power from a plug outlet.

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Definition: Thermal energy is the internal energy of an object due to the kinetic energy of its atoms and/or molecules.
Formula:

Where Q is the thermal energy, m is the mass of the given substance, c is the specific heat and ΔT is the temperature difference

Example:Drying our clothes in sun.

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Definition: Mechanical energy is the sum of kinetic and potential energy in an object that is used to do work. In other words, it is energy in an object due to its motion or position, or both.
Formula:  mechanical energy = kinetic energy + potential energy.
Example: A moving car possesses mechanical energy due to its motion (kinetic energy)

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Definition: Anything that has mass.
Formula: N/A
Example: The Milky way Galaxy

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Definition: The energy  an object has due to its motion is called kinetic energy.
Formula: Kinetic energy= 1/2 x mass x Velocity2
Example: An airplane has a large amount of kinetic energy in flight due to its large mass and fast velocity.

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Definition: The potential energy associated with objects that can be stretched or compressed is elastic potential energy.
Formula: N/A
Example: If it takes 4J of work to stretch a Hooke's law spring 10 cm from its unstretched length, determine the extra work required to stretch it an additional 10 cm.

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Definition: Gravitational Potential energy increases as weight and height increase.
Formula: Gravitational Potential Energy=Weight x Height
Example: A pen being held above a table has a higher gravitational potential than a pen sitting on the table.

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Definition: Stored energy that results from the position or shape of an object is called potential energy.
Formula: N/A
Example: When you lift a book up to your desk from the floor or compress a spring to wind a toy.

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Definition: When an object or living thing does work on another object some of its energy is transferred to that object.
Formula: W=fd
Example: Playing video games.

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Definition: The ability to do work or cause change is energy.
Formula: E=MC2
Example: Kinetic/Potential energy.