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Physics

Grade 12: Work, Energy and Power

TermDefinition
Work done Work done on an object by a constant force F as FΔxcosθ, where F is the magnitude of the force, Δx the magnitude of the displacement and θ, the angle between the force and the displacement.
Work-energy theorem The work done on an object by a net force is equal to the change in the object's kinetic energy.
Conservative force A force for which the work done in moving an object between two points is independent of the path taken.
Non-conservative force A force for which the work done in moving an object between two points depends on the path taken.
Principle of conservation of mechanical energy The total mechanical energy (sum of gravitational potential energy and kinetic energy) in an isolated system remains constant.
Isolated system A system when the net external force acting on the system is zero.
Power The rate at which work is done or energy is expended.
Created by: StiKManLabs
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