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# What is the energy associated with motion called?

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The energy associated with motion is called kinetic energy. All energy comes in two basic forms: potential energy, meaning stored energy, and kinetic energy, meaning the energy of movements.

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The kinetic energy of an object is the energy that an object possesses due to its motion. In other words, the work needed to move or accelerate an object from a state of rest to its stated velocity is kinetic energy. All moving objects have kinetic energy. The word kinetic has its roots in the Greek word "kinesis," which means motion.

Kinetic energy can further be subdivided into four different categories: mechanical energy, thermal energy, electrical energy and electromagnetic radiation. The motions of people, objects and planets, the vibrations of atoms by sound waves, and the movement of electrons in electricity are a few examples of kinetic energy.

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Friction always opposes motion between two surfaces, although it is not a fundamental force of the universe like gravity. The coefficient of friction is used to describe the ratio of friction between two bodies and the outside force pressing them together.

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Isaac Newton developed the principles of modern physics through his studies on mathematics, optics and motion. His book "Philosophiae Naturalis Principia Mathematica," or "Mathematical Principles of Natural Philosophy," is often cited as the most influential document on physics. Isaac Newton is most famous for his law of gravitation.