WEP, Doppler, Electrostatics

Work done (constant force)

F Δx cos θ , where F is the magnitude of the force, Δx the magnitude of the displacement and θ the angle between the force and the displacement.

Work-energy theorem

The work done on an object by a net force is equal to the change in the object's kinetic energy.

Conservative force

A force for which the work done in moving an object between two points is independent of the path taken.

Non-conservative force

A force for which the work done in moving an object between two points depends on the path taken.

Conservation of mechanical energy

The total mechanical energy in an isolated system remains constant.

Power (Physics)

The rate at which work is done or energy is expended.

Doppler effect

The change in frequency (or pitch) of the sound detected by a listener, because the sound source and the listener have different velocities relative to the medium of sound propagation.

Coulomb's law

The magnitude of the electrostatic force exerted by one point charge on another is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

Electric field

A region of space in which an electric charge experiences a force.

Electric field at a point

The electrostatic force experienced per unit positive charge placed at that point.