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# Physics chapter 2

### Circular Motion

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

angle at the centre of a circle (rads) (θ) | = arc length(s) / radius of arc(r) |

Radians in a full circle | 2π |

rotational frequency (Hz) | no. of turns in a given time (revs per min - rpm) =1/T |

angular speed (w) (rads-1) | angle turned through in one sec =2πf or 2π/T =linear speed(v) / radius |

linear speed (v) (m.s-1) | distance covered per unit time =radius(r) x angular speed(w) |

centripetal acceleration(m.s-2) | acceleration in a circle, directed towards the middle =radius(r) x angular speed(w)^2 =linear speed(v)^2 / radius(r) |

centripetal force(N) | is the resultant force =mass x velocity^2 / radius =mass x radius x angular speed(w)^2 |

centripetal force | -increases with mass -increases with square of speed -decreases as radius increases |

period (T) | seconds for one revolution =1/f |

linear displacement(s) (metres) | distance traveled along circle =angular displacement(θ) x radius |

angular displacement(θ) (rads) | angle traveled through =2π x t / period(T) =angular speed(w) x t |

rads into degrees | 180/π x rad answer |

weight of object in circular motion | =mass x acceleration(centripetal) |

centripetal force in circle | make an equation of forces e.g = tension - weight |

Created by:
larasansun