Work is the energy required to move an object against an opposing force. Work is usually expressed as a force times a displacement.

When a constant force *F* acts on a point-like object while the object moves through a displacement *s*, the force does work *W* on the object. If force and displacement are at a constant angle Θ to each other, the work is expressed by the scalar product of these two vectors:

When the force *F* on a point-like object is not constant that is, it depends on the position of the object, the work done by force while object moves from initial position with coordinates (*x*_{i}, *y*_{i}, *z*_{i}) to final position with coordinates (*x*_{f}, *y*_{f}, *z*_{f})is given by expression:

Where *F _{x}*,

SI unit for work is joule (J); 1 J = 1 Nm = 1 kg m^{2} s^{-2}. The electron-volt (eV) is commonly used in atomic and nuclear physics.

Generalic, Eni. "Work." *Croatian-English Chemistry Dictionary & Glossary*. 20 Oct. 2018. KTF-Split. {Date of access}. <https://glossary.periodni.com>.

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