Work, Energy and Power Flashcards
Work done on an object by a force
The product of the displacement and the component of the force parallel to the displacement.
Gravitational potential energy
The energy an object possesses due to its position relative to a reference point.
Kinetic energy
The energy an object has as a result of the object’s motion.
Mechanical energy
The sum of gravitational potential and kinetic energy at a point.
Law of conservation of energy
The total energy in a system cannot be created nor destroyed; only transformed from one form to another.
Principle of conservation of mechanical energy
In the absence of air resistance or any external forces, the mechanical energy of an object is constant.
Work-energy theorem
The work done by a net force on an object is equal to the change in the kinetic energy of the object.
Power
The rate at which work is done or the rate at which energy is transferred.
1 Watt
The power when 1 joule of work is done in one second. (1W=1J.s-1)
Efficiency
The ratio of output power to input power
