Energy Concepts Flashcards
(15 cards)
Define energy
The ability to do work
What is energy measured in
Joules
What is work?
The process of energy transfer when a force causes displacement
What is the equation for work
Work = Force x Displacement x Cos(angle between force and displacement)
What is kinetic energy
The energy associated with moving an object
What is the equation for Kinetic energy
KE = 1/2 m v^2
What is GPE
Gravitational Potential Energy, the energy a particle possesses due to its height above the ground
What is the equation for GPE
mgh
Mass x 9.81 x height
What is elastic potential energy
Energy stored in elastic materials as a result of their compressing or stretching
What is the equation of KE
1/2 k x^2
1/2 x spring constant x displacement ^2
What is the principle of Conservation of Energy
That energy can neither be created or destroyed, only transferred
What is Power
The rate at which work is done or energy is transferred
What is the equation for power
Power = Work/Time
What is efficiency
How much of the input energy has been converted to work done
What is the equation for efficiency
(Useful energy / total energy) x 100
