work , energy , power

Work

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.

Watt

The power when one joule of work is done in one second.

Efficiency

The ratio of output power to input power.