The work done by a force acting on a body is the force along the direction of the displacement multiplied by the displacement of the point of application.
Like energy, it is a scalar quantity, with SI units of joules. Heat conduction is not considered to be a form of work, since there is no macroscopically measurable force, only microscopic forces occurring in atomic collisions. The term work was created in the 1830s by the French mathematician Gaspard-Gustave Coriolis.
If a constant force F acts on an object while the object is displaced a distance d, and the force and displacement are parallel to each other, the work done on the object is the product of F and d:
If the force and the displacement are in the same direction, the work is positive. If the force and the displacement are in opposite directions the work is negative.
References[change | change source]
- "Definition of Work in Physics". Western Washington University. http://faculty.wwu.edu/vawter/PhysicsNet/Topics/Work/DefinitionWork.html. Retrieved 2014-11-04.
- Holzner, Steven (2010). Physics Essentials For Dummies. Wiley Publishing. p. 78. ISBN 978-0-470-61841-7.
- Jammer, Max (1957). Concepts of Force. Dover Publications, Inc.. ISBN 0-486-40689-X.
- Tipler (1991), page 138.
- Resnick, Robert and Halliday, David (1966), Physics, Section 7-2 (Vol I and II, Combined edition), Wiley International Edition, Library of Congress Catalog Card No. 66-11527