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# Physics SHM ISA

### Physics ISA AQA 2012

Question | Answer |
---|---|

What is free oscillation? | When the amplitude is constant because no frictional forces are acting. |

What is angular frequency? | 2*pi*f OR (2xpi)/T |

What is the unit for angular frequency? | rad per second |

What is the phase difference? | (2*pi*delta t)/T |

What conditions must be satisfied to use the phase difference equation? | The objects must be oscillating at the same frequency. |

What is the formula for acceleration? | -(2*pi*f)^2 * x |

What is the formula for displacement? | A * cos(2*pi*f*t) |

What is the formula for velocity? | plus or minus 2 times pi times f times the square root of A squared minus x squared |

What is the formula for maximum speed? | 2*pi*f*A |

What indicates reliability? | How close the points are to the line of best fit. How close repeat values are. |

What is uncertainty? | Half the range |

What is percentage uncertainty? | half the range divided by the average value then multiplied by 100 |

What is the percentage uncertainty of AB? | The two percentage uncertainties added together |

What is the percentage uncertainty of A cubed? | 3 times the percentage uncertainty of A |

Define error | The difference between a measurement and its accepted value (the most accurate value) |

Define precision | The degree of exactness |

Define precision of an instrument | The smallest non-zero reading the instrument can measure |

What is the precision of a vernier calliper? | 0.1mm |

When asked to plot ? against ? which is on the y axis? | the first one |