energy - the ability to do work or cause change, kinetic energy - the energy of an object in motion, potential energy - the energy that an object possesses due to its position or condition, gravitational potential energy - the energy an object possesses due to its height above the ground, mechanical energy - the sum of an object's kinetic energy and potential energy, joules - the unit used to measure energy, thermal energy - the energy associated with the motion of particles in a substance, chemical energy - the energy stored in the bonds between atoms and molecules, electrical energy - the energy associated with the flow of electric charges, sound energy - the energy produced by vibrating objects, nuclear energy - the energy stored in the nucleus of an atom, energy conversion - the process of changing energy from one form to another, elastic potential energy - the energy stored in an object when it is stretched or compressed, light energy - the energy produced by electromagnetic waves that we can see, friction - a force that opposes the motion of objects in contact, Law of Conservation of Energy - energy cannot be created or destroyed, only transferred or transformed from one form to another, energy efficiency - the ratio of useful energy output to the total energy input in a system or process,

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