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# GCSE C21 P4

### GCSE C21 P4 Explaining Motion revision

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

Instantaneous Speed = | Distance / Time (small distance and short time) |

Average Speed = | Distance / Time (journey distance and journey time) |

Speed from a distance time graph… | find the gradient of the graph = vertical / horizontal |

In a distance time graph horizontal means | 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 object is moving backwards / towards you |

Velocity is speed and | direction |

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

In a velocity time graph horizontal means | constant speed |

In a velocity time graph the steeper the slope... | the greater the acceleration |

In a velocity time graph uphill sections indicate... | Acceleration or speeding up (positive acceleration) |

In a velocity time graph downhill sections indicate.. | deceleration or slowing down (negative acceleration) |

Newton’s third law: if you push against a wall the wall... | pushes back on you |

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

Momentum = | mass x velocity |

Change in momentum = | FORCE x TIME (resultant FORCE x TIME for which the force acts) |

Change in energy is the same as | Work done |

Work Done = | Force x Distance |

Kinetic Energy | 1/2 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 |

Units for kinetic energy | J or joules |

Units for potential energy | J or joules |

Units for mass | kg or kilograms |

Units for speed (standard scientific units) | m/s or metres per second |

Units for momentum | kg m/s or kilogram metres per second |

Units for work done | J or joules |

Units for weight | N or newtons (weight is a force) |

Units for force | N or newtons |

Created by:
allydavies
on 2010-06-16