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# A level Physics 5.3

### 5.3 OCR Physics

Term | Definition |
---|---|

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. |