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# Phys P1 Definitions

### Definitons for paper 1

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

Displacement | A change in position |

Velocity | The rate of change of position/ or the rate of displacement/ or the rate of change of displacement/ and know that velocity is a vector quantity |

Acceleration | The rate of change of velocity |

Newton’s First Law | An object continues in a state of rest or uniform velocity/ unless it is acted upon/ by a net or resultant force |

Newton’s Second Law | When a net force (Fnet) is applied to an object of mass (m) it accelerates in the direction go the net force. The acceleration (a) is directly proportional to the net force and inversely proportional to the mass |

Newtons’s Third Law | When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A |

Friction(Ffr) | The force that opposes the motion of an object and acts parallel to the surface with which the object is in contact |

Weight(Fg) | The gravitational force the Earth exerts on any object or near its surface |

Electric Current(I) | The rate of flow of charge (I = q/t) |

Coulomb’s Law | Two point charges in free space or air exert forces on each other. The force is directly proportional to the product of the charges and inversely proportional to the square of the distance between the charges. |

Resistance | A material’s opposition to the flow of electric current |

Law of Conservation of Charge | Charge is neither created or destroyed. It can only be transferred from one system to another |

Magnitude of Electric field at a point | The force per unit positive charge (E = F/q) |

Electric Field | A region of space in which an electric charge experiences a force. The direction of the electric field at a point is the direction that a positive test charge would move if placed at a point |

Lenz Law | The induced current flows in the direction so as to set up a magnetic field to oppose the change in magnetic flux |

Faraday’s Law | The emf induced is directly proportional to the rate of change of magnetic flux (flux linkage) |