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# Density & Motion

### Revision of Motion and Density chapter

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

What is speed? | The distance travelled per unit time |

What are the standard units of speed? | metres per second (m/s) |

If a car travels a distance of 60km in 2 hours, calculate the average speed of the car. | 30km/h |

If a runner runs at a speed of 4m/s, what distance would he travel in 8 seconds? | 32m |

How long would it take a walker to travel a distance of 100km, walking at a speed of 2km/h? | 50hours |

What is acceleration? | The rate of change of speed. |

What are the standard units of acceleration? | metres per second squared (m/s2) |

If a runner starting from rest reaches his maximum speed of 12m/s in 4 seconds, what is his acceleration? | 3 m/s2 |

If a car moving at a speed of 40m/s brakes suddenly down to a speed of 10m/s in a time of 3 seconds, calculate the cars deceleration. | -10m/s2 |

What is velocity? | The speed and the direction in which something is moving. |

What is density? | The mass per unit volume of a substance. |

What are the standard units of density? | (kilogrammes per metre cubed) kg/m3 |

What is the density of copper if 223g of it occupies a space of 25cm3? | 8.91g/cm3 |

If the density of oil is 0.8g/cm3, what volume would 20g of it occupy? | 25cm3 |

If a gradutated cylinder is filled with syrup at the bottom, water in the middle and oil at the top, which of the three liquids has the lowest density? | The Oil |