Energy concepts Flashcards
Work done
f x d (the force multiplied by distance moved in the direction of the force
Kinetic energy
The energy possessed by a moving object
gravitational potential energy
energy possessed by an object due to its position in a gravitational field
elastic potential energy
energy possessed by an object due to its deformation
conservation of energy
Energy cannot be created or destroyed only transferred
Power
P = e/t or work done/t (The rate of energy transfer)
Mechanical energy
sum of its potential and kinetic energies
dissipative forces
Forces which lead to a loss in mechanical energy in a system
Internal energy
The sum of random kinetic and potential energies of the individual particles in a system
Efficiency
the fraction of the input energy which is usefully transferred
