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# 5.3 OCR Physics

TermDefinition
Amplitude amplitude is the maximum displacement from the equilibrium position
Angular Frequency Angular frequency is product of 2π x frequency OR 2π/period (the number of radians covered per second)
Centripetal acceleration AN acceleration which is directed towards the centre of a circular path.
Centripetal force a force which acts on a body moving in a circular path and is directed towards the centre around which the body is moving and is perpendicular to the velocity (hence it does no work)
Displacement displacement is the distance (of the body) from an equilibrium position.
Frequency frequency is the number of oscillations/cycles per unit time/second
Natural frequency The frequency at which a system will undergo a free oscillation.
Period The time taken to complete one full oscillation.
Phase Difference Phase difference of two oscillators is a measure of how "in step" different oscillations are. If moving together they are said to be in phase. If not they are said to be out of phase.
Radian The angle subtended at the centre of a circle by an arc of length equal to the radius of the circle. Hint - draw diagram for this definition.
Resonance Resonance occurs when the driving frequency matches natural / resonant frequency (of system). The amplitude of vibrations / energy (transferred) is then a maximum.
Simple Harmonic Motion An oscillation where the acceleration proportional to displacement(from the equilibrium position) and is always acting towards the equilibrium position / the mid-point of the motion.
The period of an object describing a circle The time taken to complete one full orbit.
Created by: susan casey