Energy can neither be created nor destroyed. It can only be transformed from one form to another. The transformation of energy can lead to a change in state or motion. Energy can also be converted to mass and vice versa.
Version for ages 12 to 15
When energy is transformed from one form to another, its total amount remains constant. The transfer of energy from one body (or system) to another or a change in its form can cause a change in state or motion. The amount of energy transferred or transformed during a motion is called work.
Version for ages 9 to 12
Energy is what makes every change possible throughout the universe. Energy can have many faces (forms) and it can be transferred from one body or system to another. However, its total amount remains constant. It cannot be created or destroyed.
Breaking down of the Energy Big Idea of Science
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Forms, Conservation of energy and energy transfer
Energy can be transferred from an object to another or to the environment when a force is acting on it. However, the total amount of energy always remains the same. The two main forms of energy are potential energy and kinetic energy while the two forms of 'energy in transit' (or types of transfer process) are heat and work.
Energy and forces
Objects can interact from distance or when in contact, through the fundamental interactions. When these interactions occur, energy is transferred or transformed. Depending on the acting force, we have different forms of energy.
Energy in chemical reactions
Energy is required for chemical reactions to occur. When a chemical reaction is triggered, energy is transformed. All living organisms transform energy from one form to another to be able to fuel their activities.