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# P4 Revision

### 21st Century Science P4 revision

Questions | Answers |
---|---|

Speed is .... | The distance travelled in a certain time. |

The formula for speed is | Distance / Time |

the axis in a distance speed graph are... | Time on the x axis and Distance up the y axis. |

Speed can be calculated by | calculating the gradient of the graph horitontal / vertical |

In a distance speed graph the flat sections are .... | where the object is stopped |

In a distance time graph the steeper the slope... | the faster the object is going |

In a distance time graph the downhill section means.. | the objct is coming back towards you. |

When talking about distance time graphs distances can be.... | positive or negative. |

Speed is just a number but.. | velocity has direction too |

in a velocity time graph gradient represents.... | acceleration |

in a velocity time graph flat sections represent... | constant speed |

in a velocity time graph the steeper the slope... | The greater the acceleration |

In a velocity time graph uphill sections indicate... | acceleration |

in a velocity time graph downhill sections indicate.. | deceleration |

in a velocity time graph the area under the graph is equal to... | the distance travelled in that time interval. |

Forces occur when...... | two objects interact |

If you push against a wall, the wall... | pushes back |

Moving objects normally.... | experience Friction |

Resultant force is... | the overall force acting on an object. |

The formula for Momentum is | mass x velocity |

The formula for change of momentum is.. | Resultant force x time for which the force acts |

change in energy is the same as.. | Work done |

The formula for work done is | Force x Distance |

The formula for kinetic energy is | half x mass x velocity squared |

The formula for change in gravitational potential energy is | Weight x change in height |

Falling objects convert gravitational potential energy into | Kinetic energy |