Work, Energy, Power Flashcards
Principle of Conservation of Energy
Energy can neither be destroyed nor created in any process. It can be transformed from one form to another, and transferred from one body to another, but the total amount remains constant.
Mechanical energy
The mechanical energy of a system is the sum of the kinetic energy and ALL the potential energies present at an instant.
Principle of Conservation of Mechanical Energy
Principle of Conservation of Mechanical Energy states that in the absence of any net external force, the total mechanical energy of the system is conserved.
Work done by constant force
The product of the force and the displacement in the direction of the force.
Work done by variable force
The area under the force-displacement curve.
Chemical energy
The energy associated with motion and interaction of electrons in atoms and molecules.
Nuclear energy
Energy associated with motion and interaction of protons and neutrons in nuclei.
Electromagnetic Energy
Energy associated with the interaction of electric charges and currents.
Mass Energy
The energy equivalence of mass as given by Einstein’s equation E = mc^2.
Kinetic energy
The energy an object possesses by virtue of its motion.
Potential energy
The ability to do work as a result of the position, shape or state of an object.
Gravitational potential energy
Ability to do work due to height or position of mass.
Elastic potential energy
Ability to do work because of a change of shape of an object.
Power
Work done per unit time
Instantaneous power
Calculated by using P = Fv where F = force applied and v = velocity.
